I think you are strawmanning a bit in this as well if you're framing talent trees as "artificial restriction" and that i'm trying to restrict play by proposing user choice. That term is almost as good as EA's "surprise mechanics". You've come up with an interesting way to frame player choice as a negative. Never heard it described that way before. I think maybe you process player choice as a means to maximize your character and so things that are un-optimal have no use for you and there is nothing wrong with that if you fall into the "hardcore" group that's your main motivator. That's not my main motivator so I wouldn't call it an illusion of choice. For me choice breaks up monotony and stale play. I dont see the "restriction" it is not implied the rotation would be the same or class would play similarly to the point that all abilities could just be used at the same time rather than talented.
I'll play meme builds and non-optimal builds because they are fun and I play the game to have fun. Do I expect to bring it into high end raiding? No, but the fact remains choice that leads to multiple ways to play your character and new out of the box theory-crafted builds is fun for a lot of people. There is a fun aspect ontop of the optimization aspect, thats why we play games, and this is not to say there cant be multiple optimal builds depending on the content or scenario because there is for many games.
If people are "bored" this is a solution rather than wholesale re-making the class to the point its almost a new class every expac. If any of what I propose was a bad thing there wouldn't be lists of optimal builds for ESO or Guild Wars or any game for that matter. Different strokes for different folks I suppose as they say not everyone likes sandbox style tools to loadout their character and for some only the optimal build is fun for them. The point is having options equals more to do equals more fun. In Wow Classic as Druid I can do heart of the wild spec for healing or tanking, I can do switfmend spec for healing, I can do a spec with omen of clarity. They were even theory crafting up a melee moonkin balance spec at one point or I can farm manual crowd pummlers for the on use ability and play feral with mid pack dps in raids etc. for me thats exciting I dont care if its the L33t optimal spec for MC its fun and if im in a good guild they will let me run it anyway.
I say homogenization because no matter what you do with tanks in FFXIV the rotation will be the same with the same expected finisher and ogcds thrown in. Thats boring and I can see why people get sick of it after running the same thing 300 times and demand changes every patch. We cant just go respec we have to go play another Job if we want more flavour as it is now. Its a bit rediculous to re-invent the wheel every patch. For example there is a subset of people that do like the HW Drk, etc. those people end up screwed. The people that asked for the changes every patch are screwed as well because after another 300 runs they are bored again of the new version of drk and no one is happy for long. Giving us one rotation path is like giving us all these straight line dungeons with no nooks. Is it optimal sure? Is it necessarily fun though no. Its like a vicious circle. Id rather have multiple load outs or ways to spec out for the sake of boredom while also being fair to those that like it the way it is currently and want smaller additions each expac to their class.