Squish is getting squishier, what about my placement?

I’m happy things are changing but like many holding my breath on the results. The one thing I wish I knew is why there is a need for a squish. Gac already has seasons, so just set each league at 20 percent and each division at 10/25/30/25/10 levels and run the season. Rinse repeat and rinse. I’m sure there are reasons why this doesn’t work but I can’t see them.