> For example, there may be users that use WMs like Blackbox, StumpWM, or Xmonad that they've heavily customized throughout many years, and now they're essentially being told that their setups will eventually be incompatible with the changing ecosystem.

Yes. You got a wonderful set of tools as a result of all the work and time folks put into X.

The problem is that the folks doing most of the lifting in this space right now, the ones still giving their free time and effort, have decided that they'd rather be developing Wayland (it's not all of them, X is still kicking, but it's a lot of them).

You, as a user of the free software produced by real people putting in time and effort, absolutely don't get to bitch about "Loss of choice is a loss" when what you're really saying is "I'd like to force the people working on wayland to continue working on X, because it's beneficial to me".