I used to work at a company where our git repository would get so polluted with change-related junk that we had to call (many times literally call) BitBucket and ask them to run git clean up on the remote. Otherwise, fetch/pull and many operations on remote would take forever or often even fail completely due to timeout or lack of RAM.

It's Thursday and you wanna release a hotfix - but nope - all builds are failing because git can't cope with junk and your CI can't proceed. You then have to call BB instead and ask them to clean up, hoping they'll do it within the same day. Ah, exciting times.