I'm a big fan of the rebase workflow, but not of squashing. I wrote it as several separate commits for a reason: documenting each step, making each step revertible, separating refactors from from semantic changes, etc. Squashing makes the diffs much more painful, such as by burying an important change in a sea of mechanical ones when they were originally in separate commits.

(A workflow that preserves those commits requires actually having useful commits, and obviously if you have PRs with commits like "fix it" and "fix it more" then it might as well get squashed.)