We squash. I'm not really interesting in your local journey to land the change. It's sometimes useful during review, but after that it's mostly the state of the main branch I care about. It's what I need to bisect anyway.

I don't like commits that are just references to issues. Copy the issue into the commit message so git blame tells you something useful. Unless it's just closing a simple big. Then the title and issue reference are plenty.

Depends on the project I imagine.