Is this from experience? I've switched back to regular vim from neovim because of platform support, but I've never had stability issues when I did use neovim.

Yes, it's from experience. I'm maintainer of https://github.com/SirVer/ultisnips snippet plugin for vim, and I'm often see issues when people can't get it work under nvim due nvim internal issues.

From experience:

neovim often forgets basic settings for indentation, it's the only flaw I've experienced myself but it's enough that I can't use it.