So much this. Everyone needs to learn about --first-parent, it makes git log, git bisect, etc... so much more powerful and prevents people from just squashing PRs into giant mega-commits that make the history so much less useful.
I keep joking that all we need is one good Git GUI to go viral that defaults to --first-parent in every view and we might eventually convince more people they don't need to squash/rebase as much. One of these days I may even take the joke far enough along to prototype something.
