Controvery over commit styles

Yes, you're correct. On the other hand, there are already numerous tested and proven workflows to implement both the bissectability and clean history, AND allow for the work-in-progress dirty history.

In the simpler one, you use at least two work branches, plus the mainline branches. You move the ready-and-tested work from the dirty work branch to the mainline through an intermediate cleanup branch. The no-mess, no-regression, clean history for bissectability requirements exist only in the mainline and intermediate cleanup branches.