[another-acct]

> GitLab [...] compares different iterations of the force-push "naively", so if your force-push includes for example a rebase onto master because another MR has been merged ahead of yours, the diff will include the changes that have been rebased onto

That's quite the deal breaker IMO; for example it couldn't be used to compare a backport series (targeting an older stable branch, for example) against the original commit range on the master branch.