An Idea That Would Drive Collectors Mad

I'm guessing this has been discussed before, but if it has, I missed it.
Why don't the grading services offer "split grading?" A grade for the obverse, and a grade for the reverse?
So many times I've seen coins with a wonderful reverse, but an obverse that was lacking, and dragged the overall grade down.
This would be a bonanza for the grading services as slabbed coins would need to be resubmitted to meet the new standard.
Yes, I can hear the moaning and groaning, as well as the gnashing of teeth at the mere suggestion, but I think it would eventually be embraced.
Then after a reasonable period would undoubtedly come, "edge grading!"
Now someone will respond with the name of some little known grading service from the murky past yhat tried this, and failed to catch on...