I liked it. I would have wished you'd mention that you can cast Pyroblast to build storm. Playing Pyroblast against MUD is still possible but REB isn't. Other than that, cool article.
Other decks just want a spell cast – and they don't care what it is. In a storm deck like Vintage TPS with Tendrils of Agony, casting a Pyroblast on a random land could generate that one last storm you need to win, while a Red Elemental Blast would be stuck in hand.
Again, Pyroblasts aren't typically the go-to disruption spell for a storm deck. If you do run them, chances are pretty good you'll be using them for their intended purpose far more often than you'll generate storm with them. Just like the Threshold example above – if you find yourself in a tournament, using Pyroblast on a land to generate storm more than one or twice in the event, you should strongly consider running something else. Repeal or Lava Dart can be used to generate storm much faster, for instance – if Pyroblast is really so unnecessary.
I thought this article was pretty good. I'm also interested to see where you go with the "budget replacement" article.
