These are great suggestions, but did I understand that suggest git as an alternative to overleaf? That's... not at all reasonable, as well as completely missing what problems overleaf solves for which people. Overleaf ist git und the hood. But what it really provides is Google Docs style collaboration on Latex documents.

Reviewing the changes I review in Overleaf in GitHub pull requests would be incredibly painful and introduce a completely new, convoluted and unintuitive (until you're used to it) workflow for collaborative editing.