I could be wrong, but I believe it has been close to 10 years since there last was a vote on splitting them or not. I bet it would be a different percentage now.
Pretty interesting class 3-5, for quarterfinals there is one STL suburban public school still alive (Parkway C). Pretty telling when there is no other Rockwood, Parkway, Hazelwood schools still alive. Class 6 you had Marquette in the quarters, and they were running clocked. Pretty telling when there is no other Rockwood, Parkway, Hazelwood, Mehlville schools still alive. Almost seems like they have players being plucked from their boundaries and going to privates.
FWIW, I have no ill will against families being given an opportunity to have a private school education. Just put them in their own classification.