You can squash locally, that's fine, so long as you then locally run tests on the new squashed commit before pushing. What I think is problematic is rebasing e

You can squash locally, that's fine, so long as you then locally run tests on the new squashed commit before pushing. What I think is problematic is rebasing entire branches weeks after their commits have last been touched. The more you rely on manually looking through commit histories, the more you're encouraged to do this. EDIT: something I forgot to mention in my original comment as well is that it rebasing makes collaboration harder. Basically, overall, we spend a lot of effort working around the drawbacks of rebasing, when we should be trying to eliminate the need to rebase in the first place.