I use helix part-time but am forced to go back to neovim a majority of the time for a few reasons:
- no persistent undo
- no ctags and cscope (some C/C++ projects don't work well with clangd)
- niche plugins (e.g. I just found a neovim plugin that gives me a way to run ipynb files in-editor)
If 1 and 2 got fixed, I'd be a full time helix user
In vim you can make some changes to a file, close vim, and then reopen the files, and then undo your changes, i.e. your undo history persists across sessions.