I switched to neovim about six years ago because completion backed by language servers was unusably-slow without neovim's asynchronous support. That was added to Vim in 8.0, and since then, there's been no difference between the two for my workflow. I use the same config for both Vim and neovim (save for a couple minor unimportant tweaks).

I don't think there's a compelling reason for many people to switch to neovim right now. I appreciate that the appearance of neovim was a real kick in the ass and prompted improvements in Vim. Vim had been essentially stagnant with no new features for a decade. It's now got frequent releases and tracks neovim's improvements closely. neovim's existence continues to improve Vim itself through innovation and competitive pressure.

I value neovim for how it's revitalized the Vim community, and I still use it mostly because while there's no reason for me to switch to neovim these days, there's also no reason to switch back.