I can understand how you could see this as an advantage, but I see forcing this on the developer as more of a disadvantage. I literally never want to see in any history commits with junk attempts to fix something. After the fact, these are the least interesting things to me.
That doesn't keep the branch names. It also doesn't help bisect complex merges. Git may be better at that now, to be fair. So many projects rebase or squash that I haven't had to do it in a while.
Mercurial can rewrite history in the same ways as Git.
I never want to see junk commits, but I can't force other people to spend time cleaning them up. Squashing cleans them up quickly but loses useful information.
