Dig through time and tcruise aren't very well suited for ritual decks, I tried them and most of the time they were either dead cards or win more. Tcruise has applications in particularly grindy blue matchups when you are in tdeck war; Dig would be great if it didnt cost UU since getting to two blue mana to resolve a tutor isn't really what the deck was designed for (as mentioned in the op the only blue card with uu in it's cost that sees consistent play in ritual decks is mind's desire). The delve part was never the hardpart however, since ritual decks tend to generate a lot of cards in their grave quickly. If they had printed a delve card that was a copy of a draw7s or a ritual bomb instead there would be no doubt they would be very good for the ritual pillar, but the role Cruise and Dig fill just isn't efficient enough compared to the ressources they ask you to pour into them for a ritual deck.
I used to play Gifts in Long variants too but it was just too slow and somehow out of place. Ad nauseam should probably be included before Gifts there.
I am still quite new to this, so perhaps my opinion doesn't carry much weight, but I agree with you. I play MTGO, I sold off some unused cards and bought power and two storm deck shells, gush based one, and a TPS deck. The TPS deck had Dig and Cruise in it, and I never felt like I wanted to be casting them. I feel like it goes against the plan of using Yawgmoth's Will. The times I tried to cast the cards, I had to try and decide what cards I could afford to delve away. I don't want to delve away Lotus, Petals, or even rituals. Fetch lands are fine to delve away, but many cards are important in the graveyard.
I played Legacy with U/R Delver, and when you can just mindlessly eat your graveyard because it yields no other value to you, then Treasure Cruise is an insane card. If not, then not so much. I even ran into issues with card types, delve, and Tarmogoyf in other decks.
Like I said, I'm new, so seeing someone else with experience who has a similar opinion is very reassuring.
But I think In a tps shell with more control elements and more lands, gifts would be the perfect enabler since draw7s and co are way too unreliable for it.
If you are using Past in flames how does Led make a lot of sense? you can't replay it after. Past in flames has some undeniably strong applications with gifts but not being able to replay the lotus, led and petal are really severe drawbacks much more so than the mana cost.
Is adding a third color really what we want? could be, Red also gives us acess to Burning Wish (more gifts synergy) and wheel of fortune or even sideboard cards like Ingot Chewer and Reb/Pyro.
Gush Storm also makes a really good use of gifts (probably the best imo). Since it naturally runs regrowth and all it wants to do is find fastbond or setup a lethal Ywill and can much easier accommodate Mana drain. (Ritualling into Gifts isn't that good)
Idk who made the list in the op, it looks solid but it seems like it has a few subpar cards maindeck (Inkwell, Time Walk, 2nd tendrils and chrome mox). The sideboard doesn't seem consistent with the metagame realities rituals decks have to contend with as I've come to understand them. No way that list is beating shops consistently post board (Ie win g2 on the play and g3 on the draw) and since it's very likely to loose game ones, it seems poorly positionned in that matchup which you should be gunning at with your sideboard since it's theoretically your worse matchup.
On the other hand it packs hate for dredge which it's supposed to ignore and race with and still be one of it's more favored matchups. Dredge doesn't even see that much play, seems pretty overkill.
I like the plague spitter tech though, gotta be nice vs thalia decks.
For reference, here is my most recent list:
3 Polluted Delta
2 Bloodstained Mire
1 Badlands
1 Volcanic Island
1 Underground Sea
1 Swamp
1 Island
1 Library of Alexandria
1 Tolarian Academy
1 Black Lotus
1 Lion's Eye Diamond
1 Lotus Petal
1 Mana Crypt
1 Mana Vault
1 Mox Emerald
1 Mox Jet
2 Mox Opal
1 Mox Pearl
1 Mox Ruby
1 Mox Sapphire
1 Sol Ring
4 Dark Ritual
4 Duress
2 Defense Grid
1 Chain of Vapor
1 Repeal
1 Hurkyl's Recall
4 Burning Wish
1 Demonic Tutor
1 Vampiric Tutor
2 Gitaxian Probe
2 Preordain
1 Ponder
1 Brainstorm
1 Sensei's Divining Top
1 Necropotence
1 Yawgmoth's Bargain
1 Ancestral Recall
1 Windfall
1 Wheel of Fortune
1 Memory Jar
1 Tinker
1 Timetwister
1 Tendrils of Agony
Sideboard
1 Island
1 Mountain
1 Scalding Tarn
2 Ingot Chewer
2 Hurkyl's Recall
1 Rebuild
2 Defense Grid
1 Shattering Spree
1 Pyroclasm
1 Tendrils of Agony
1 Yawgmoth's Will
1 Mind's Desire
EDIT I think Gifts definitely has some very strong potential in a ritual shell. I've started to test a Grixs (UBR) list with burning wish and gifts, higher land count and countermagic as disruption as well as the usual combo enablers. Even without brainstorm the deck has pretty consistent draws due to a fair amount of manipulation and a high threat density.
At first I had a lot of trouble to get the deck to 60 cards because i wanted to have 4th gifts, 4th wish, 3rd probe, 2nd preordain, 4th ritual, scroll, blightsteel, snapcaster, time walk and 3rd misstep. but I opted to instead focuss the deck around tendrils and abandon the bot kill which allowed me to cut Timewalk since It's not an optimal slot for a tendrils deck imo, Snapcaster isn't needed to make lethal gifts piles with tendrils.
3 Polluted Delta
3 Scalding Tarn
2 Underground Sea
2 Volcanic Island
1 Island
1 Swamp
1 Library of Alexandria
1 Tolarian Academy
1 Black Lotus
1 Lotus Petal
1 Mana Vault
1 Mana Crypt
1 Mox Emerald
1 Mox Jet
1 Mox Pearl
1 Mox Ruby
1 Mox Sapphire
1 Sol Ring
3 Dark Ritual
1 Cabal Ritual
1 Sensei's Divining Top
1 Brainstorm
1 Ponder
1 Preordain
2 Gitaxian Probe
3 Burning Wish
1 Vampiric Tutor
1 Demonic Tutor
1 Chain of Vapor
1 Hurkyl's Recall
2 Mental Misstep
2 Flusterstorm
4 Force of Will
1 Necropotence
1 Yawgmoth's Bargain
1 Ancestral Recall
3 Gifts Ungiven
1 Tinker
1 Memory Jar
1 Timetwister
1 Wheel of Fortune
1 Tendrils of Agony
SB: 1 Island
SB: 1 Mountain
SB: 2 Ingot Chewer
SB: 2 Hurkyl's Recall
SB: 1 Rebuild
SB: 1 Flusterstorm
SB: 2 Mental Misstep
SB: 1 Shattering Spree
SB: 1 Toxic Deluge
SB: 1 Yawgmoth's Will
SB: 1 Mind's Desire
SB: 1 Tendrils of Agony
Probably needs a lot of work but I feel like it's very powerful as well as resilient and is a strong base to build upon with further testing.
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