Here's the thing, we've all argued for years of the "fairness" stemming from private and public school advantages. Each has their own set, private schools have expanded boundaries while public schools have free tuition and generally better facilities. Both groups have programs that take advantages of those to create successful programs, both groups have programs on the opposite end of the spectrum.
What seems to be being ignored is that both sets of advantages create the ability for said public/private school to reach a new competitive level, regardless of their enrollment size. Should Rochester have been 4A the past few years or did they prove they can now compete with higher classes? Same to Montini, SHG, etc?
The issue here is not privates vs publics, it's a competitive in-balance in the classes that attempt to judge "competitiveness" by enrollment. That's the fundamental issue, and that's what isn't being addressed by a blanket multiplier, separation, or any other enrollment-centered solution. However rushed and poorly implemented it may be, at least the success factor is a step towards that direction.