Ps4 Pro seems very rushed and messy with games running worse on Pro than reg Ps4, and no real infrastructure to explain the differences to consumers on a game by game basis. I dunno, you can spin it whichever way you want. It's more likely they both saw 4k coming and knew they could leverage it to keep charging high prices for hardware while discounting their base models and making up for how weak the base consoles are.
Have you been paying attention to the Pro and it's games? They run fine and outside of one or two cases run better.