but I think it is easier to dictate what opening you will play in a Sicilian (for example, after 1. e4 e5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 - already on move five you can dictate whether white will be playing against a Najdorf,Dragon, Kan, or Schevengin, all depending on your next move - a6, g6, a6 or e6).
I agree with your post in general, but here you make it sound like Black chooses the type of game in the Sicilian!
Yes, on move five black has an important choice. But before that, white has already had the option of a entire array of anti-Sicilians, all different, and after move five, white can still decide the type of game!
Say you pick the Najdorf, white can still choose all the way from solid and positional (6.Be2) to ridiculously tactical (6.Bg5), and everything in between (6.Bc4, 6.Be3, 6.f4, 6.f3, 6.a4, they're all different). Same against the other lines, perhaps with the exception of the Sveshnikov.
The Sicilian is much easier to play for white than black, if both players know equal amounts of theory.
I meant Najdorf or Dragon in my previous post.