[chippiewill]

Tools where they allow you to squash merge tend to be fairly incompatible with stack diff workflows generally.

It's tricky to review individual commits on Github and Gitlab and they don't even allow you to leave comments on the commit messages.

In areas where people do review individual commits they tend to use tools that support that workflow. Git uses email patches where each commit is sent as a separate email. Tools like Gerrit do code review directly on a commit by commit basis and the usual strategy to get it into trunk is to either "fast forward" (advance the HEAD of the trunk branch to that commit) or to cherry-pick it.