These are good questions and I hope the Paizo design team answers them, in detail with examples. Because I think some of the new proposed rules remove certain types of stories and play styles from the game.
More questions that should be answered on a per change basis, are:
• What's wrong with the old rule? What issues in play does this cause?
• How does the new rule fix the issue with the old rule?
It's my opinion that some of the new rules are only for fixing "Wrong Bad Fun" style of play. I don't like this as everyone can play their own game, the rules should support as many styles of play as possible.