Hi.
Having looked over the five-colour rules, I dislike it intensely
The format is American; the name of the format is "5-Color."
You seem to have limited exposure to the format. Your "intense" dislike seems akin to people "intensely" disliking Type 1 after reading about decks like Long.dec and Draw7.dec. Give the format a chance: you'll probably like it more than you expect.
The dexterity cards are banned in Type 1 because they create chaos not just within the game itself, but also at the table.
Playing with (and against) Chaos Orb requires very little change to one's play habits. See below.
5-C eliminates this problem by stating that once Chaos Orb is cast
Not "cast," but "revealed." As soon as Regrowth targets Chaos Orb (or you show Chaos Orb as your 'target' for Enlightened Tutor), your cards are 'pinned.'
You're no longer allowed to rearrange your cards, you can't tidy your side of the table. You can't stack or unstack piles of land
If tidiness is so important to you, then why were your lands stacked in the first place?
(not that you'd want to - they've ignored early rulings about Chaos Orb so that if a Chaos Orb lands on a stack of cards, everything below it is destroyed, whether they're actually touching or not.)
It seems to me that you're actively seeking to complain.
One of the guiding principles of the format is "Don't be a [jerk]." People don't play Haunting Echoes because resolving it is too big a hassle. People routinely *ask their opponents* to help them search for cards in their library. When the question of Tempest Efreet and Soul Foundry was raised, the response was simply "Don't be a [jerk]."
"Look, my Chaos Orb would have destroyed your Blood Moon, if you hadn't hid it underneath your Seal of Cleansing." Hiding cards is not in the spirit of the format.
People not as intelligent as you have been able to handle the rules for Chaos Orb.
Furthermore, it has a banned and restricted list rivaling (exceeding?) that of Type 1.
Exceeding. We also have a larger playable card pool, though. I don't see many competitive Type 1 decks playing Nature's Lore. I don't see many budget Type 1 decks playing Krosan Tusker.
It seems to me that since 5-C uses the same cardpool as Vintage, for the most part, but has deckbuilding rules that automatically harm some strategies, the banned and restricted lists should be much shorter, reflecting how some cards are "unbroken" by the larger deck sizes.
This is patently untrue.
Some cards are restricted due to the slower pace of the format. Future Sight, notably, is ridiculous in 5-Color; I was praising the card to Azhrei (obligatory name-dropping) well before the card saw public interest in Type 1. While most competitive 5-Color decks don't play with Planar Portal, it probably should remain restricted.
At the other end of the spectrum, Moxes are also restricted for a similar reason. If Moxes were unrestricted (in which case, Type 1 players might see a jump in price), then you're more likely to see Turn 1 Dwarven Miners. The 5CRC, the guiding body of the format, seeks to remove the impact of lucky draws on the format.
I'm interested in knowing, specifically, to which cards you are referring.
2) It requires one to play for ante.
I also know of no one that plays for real ante. Not locally, not among my friends across the country, and (allegedly) not even at 5-Color Worlds.