People who are going to min max are always going to min max. That's not a reason to throttle the fun of people who don't min max.Well it's impossible that anything they do on Gw2 causes button bloat. Your first 5 abilities are determined by your weapons, then you have one heal ability, 3 regular abilities and one elite ability. It doesn't matter if you get to choose each of those from a pool of 30 abilities, you will always end up having only 10 abilities in your bars with the exact same structure i just mentioned and the traits don't add buttons since they are all passive. And that pool of abilities? they aren't perfectly balanced either, there is a reason why every power build for guardian has sword of justice and every condition build has purging flames.
Meta builds exist, as with any other game. You have freedom to be inefficient, you can run around with power gear, condition weapons, support abilities and a mix of traits if you want, but at the end of the day there are ideal choices depending on the type of content, type of damage, role... etc. Gw2 simply has less safety barriers mostly because a lot of the choices have less impact in terms of performance.
My point being that having more choices often means having more wrong choices. Devs want a controlled environment and balance is just a way to direct players towards how they intend the specs to be played, so talent systems are often more about giving the player an illusion of choice rather than actually enabling a diverse and unique playstyle depending on your choices, that's just PR talk.