Sorry i guess my comments were mis-directed. In a way, i guess i completely agree with your point. But i'm also adding that the people who are disgruntled with the three act structure just need to step back and look at the big picture.
And really, I don't know everything. I'm learning myself. But i think the fact that i'm looking into tried and true methods will improve my ability. Writing blindly, hoping that what you have is good will seldom succeed.
The way I learned it was the "Learn the rules before you break them, and if you're gonna break a rule, put something better in its place," thing. Inasmuch as I'm completely agreeing, just my approach.
I have learned and internalised the three act structure as well. It's just how I think[ when it comes to screenplays. When I do 24 hour film festivals, we have 1 day to make a 3 minute short film. We brainstorm, think of our beginning, our middle and our end. I make a plot curve, allot the designated amount of time to each act (act I gets ~ 45 seconds, II gets 1:30, III gets 45 seconds) and figure out how to hang my plot on those points.
For some people, that could be considered suffocating. But I'll tell you this - the shorts that we've turned in in these contests (and we've placed the last 2 years in a row) are the only shorts with an act structure. the others are normally a couple of scenes but a single act, or trailers. you can tell the difference when you compare.
for a messenger, you might consider that suffocating. stifling. "you're stepping on my creativity, man..." but in all seriousness, it helps. It helps with pacing. It helps with structure. It helps to ensure that your story is complete. To be a professional storyteller, you need to know your craft inside and out. You need to know WHY the three act structure's been around since before aristotle. since before the written word. since the dawn of language. If you can sit down and knock out a story and hit all of those major "needs," as far as your structure is concerned, then you know enough to start breaking the rules.
I, for one, love films like "The Phantom of Liberty," which really does its best to defy act structure. I love surrealism. But in order for me to get to the point where I'm writing outside of act structure, I need to know enough about it to know how to still tell a complete story. I need to know what the act structure accomplishes in order for me to find a way around it.