My largest problem about rebasing a branch onto master as a single commit is that it becomes harder to do provenance. When the tip of my branch gets built (1)

My largest problem about rebasing a branch onto master as a single commit is that it becomes harder to do provenance. When the tip of my branch gets built (1) and the merge target is not ahead (2) I can actually retag the output of the build of the branch as what is now on master. When you do a squash, while the default commit message contains the SHA, it no longer carries a semantical meaning. It's just a string of text.