I'll field this one as someone who has used regular ol' Vim for ~18 years and never switched. Why switch if your tool is working fine? I use vim literally every day all day long and it does everything I need it to do. Switching has a cost and there's no reason to pay it if it's working fine.

I originally switched because neovim was more polished, had better plugins and Lua config files. I then never had a reason to go back

I ended up switching for plugin support. Other than that, unless you want to use Lua for your config files, I don't see a reason to switch either.