Android (14) still supports it, it's in Settings > System > Navigation mode (on Pixel devices, different manufacturers might put it in other menus). I still use it and will keep using it.

Same here; I found the swiping very difficult. I have also had a small number of people ask me how to switch to buttons.

Interesting, I had no idea they kept it! That's going to make my life much easier when testing if my apps work with it