[WorldMaker]

GitHub does have some stacked diff/"merge train" tools on the deeply paid side (the "Call Us" sorts of Pricing tiers) that I've only seen screenshots and demos of.

On the other side: If you get into the habit of "Reviews" on GitHub, which are in the free part, too, GitHub gives you a quick button for "Review commits since your last Review" under the Commits dropdown in the Files view. That mostly only works if you add commits rather than rebase, hence the complaints about contributing to "diff soup", but it's a reasonably useful workflow and there are workarounds on the "other side" to help deal with "diff soup".

This is why some encourage Squash Merging as the GitHub preferred merge button. Review as a bunch of small commits over time, merge an entire PR to a single final commit.

That said, as an alternative to squash merging, git itself provides some useful tools for dealing with "diff soup" style repositories using real merge commits: `--first-parent`. `git log --first-parent`/`git blame --first-parent`/`git bisect --first-parent` and more give you a "PR top-level view" in your integration branches (such as main branch) without you needing to rebase/squash.

I wish more UIs took a `--first-parent` by default approach, including/especially GitHub's weak commit views (though it is understandable why GitHub pushes you to wanting to use its PRs list instead of commit views by keeping them weak).