What you mean by how unimpaired various BACs are? I would think there would be a fairly tight curve of BAC to reaction time for an individual.
Of course most of driving is so easy that I’m sure a huge percent of the time drunk driving has no consequences, but haven’t we all been in an occasional situation that requires fast reaction to narrowly avoid a crash?
On one hand you remind people just how un-impaired various BACs are and that pisses them off.
On the other hand you make mildly sick people look like drunks and it becomes a potential pretext for denying people freedom of movement.