They ban almost everything that they have trouble fighting against and they don't use logic for what they do. This is why playing on PO is pointless and playing with friends is better imo.
Your argument isn't about letting people play how they want. You're overtly telling them to NOT play in a manner that they might just enjoy. How are you any better than the group that you profess is so bad?
I actually tried to lead a revolution against smogon back in the d/p days. That fell apart. Gamefaqers were stupid back then. Hopefully it's different now.
Or maybe people just don't like others telling them how to play their games, whether it's Smogon or not. By telling people not to play a specific way, you're doing exactly the same thing as Smogon when they say not to play a certain way.