For the reason behind edits, my collaborators and I profusely use the comments system in overleaf. This is not the same as a file diff that you might do with gi

For the reason behind edits, my collaborators and I profusely use the comments system in overleaf. This is not the same as a file diff that you might do with git, but we have got used to it now without any big changes to our larger workflow. (Tangential to your specific point but relevant to many comments here: if your collaborators are not from CS or are not s/w savvy, using git directly is not an option for them. For people who want to just use LaTeX, Overleaf lowers the minimum skill requirement to just knowing LaTeX. This is a big benefit it brings to the table.)