I've used ShareLaTeX before, and it's sort of the same reason why Dropbox is (sometimes) better than using rsync. Yes, I would prefer to edit everything in Vim but personally LaTeX environments have always been more pain to setup than they've been worth, and ShareLaTeX just works.
Also they support collaborative editing and adding editor notes to a document.
Yeah, but I find that nothing really matches the real Vim or Neovim. Especially since I have a lot of macros and mappings configured that make editing documents in "Vim-like" editors feel more painful because my muscle memory tries to use macros that aren't defined.
Also they support collaborative editing and adding editor notes to a document.