Because this is a casual discussion and that’d be more effort than I’m willing to put in.
I didn't asked you to write a research paper. You accused Git of suffering from usability issues and I asked you to provide concrete examples.
And apparently that's an impossible task for you.
If you cannot come up with a single example and instead write a wall of text on you cannot put the effort to even provide a single opinion... What does this say about your claims?
You get a cleaner history that removes noise from the run-of-the-mill commit auditing process. When you audit the history of a repo and you look into a feature branch, you do not care if in the middle of the work a developer merged with x or y branch. What you care about is what changes were made into mainline.