Other people working on the project add their ignored files to the same .gitignore. No problem.
I don't understand why people make an issue of that. Just add everything that needs to be ignored to the .gitignore, as long as it makes sense to someone. If I use XYZ-Obscure-Unknown-Editor, just let me add `.xyz-obscure-unknown-editor/` to the .gitignore. It literally has no negative impact on anyone.
There's no reason to gatekeep what goes to the .gitignore
for you and your tools, but what about everyone else?
Look at using dotfiles to sync your computer's config to multiple computers, it is a great tool