Do they? Or is the IHSAA just incapable or unwilling to do it?
Illinois determines classifications, seeding, and brackets in one weekend yet for some reason Indiana can't?
If we had district play, i.e. everyone in sectional 22 has to play a round-robin schedule or only the top 4 teams from sectional 47 (I'm just using random sectional numbers) qualified, then maybe it would be the case.
A computer algorithm that would take an input file with 320 schools, enrollments, and locations and would classify by size and then draw sectionals to minimize distance would be college senior-level project for a Computer Science major. But we wouldn't get Roncalli vs Cathedral or Chatard every first round game if we used a program to determine sectionals.