X11 isn't that important, it's the large app library it brings with it (many apps that after 24 years still have no replacements on either smartphone OS.) For power users the flexibility is nice too.
Onboard dev environments aren't useful to most people but it indicates/allows a few things:
1) Individual users who are inclined can easily improve the platform with very little effort.
2) The owners of the platform aren't stopping people from doing what they want with their own devices.
Talk about tired arguments. All popularity really means is good PR.
As to toasters and Nintendos, yes I do whatever I want with those, toasters have nothing to stop me and Nintendos are usually trivial (and often have flash carts available) to get a shell on.
I’m guessing you don’t use toasters or Nintendos either then, because you can’t do what you want with those.
The tired arguments you trot out have been covered to death. You are a hyper niche use case, pretending the general users feels like you do is delusional.