I hear you, but I still think there's room to hold back 10% of reservations on a given day and accomplish their goals.
Here's an example: I'm going to DHS on Monday of my upcoming trip but I oversleep my alarm at the 60 day mark and I get shutout for Toy Story Mania. I still make FP+ reservations for Star Tours, Tower or Terror and Great Movie Ride. When I get to DHS at rope drop that day I use the in park kiosk or my Disney App to swap out GMR and swap in one of the held back TSMM reservations. Disney still knows that I'll be at DHS that day and they can still plan ahead. The rule would still be that you can't split reservations between parks.
For the non-planners they can just arrive the day of and at least have a shot at the available reservations. Disney won't know which park they are going to that day, but that's at most 10% of guests using the system.
At the end of the day this would go a long way towards pacifying the "regulars" crowd that don't want to book reservations 60 days out and would give the planners a second chance at the reservations. The clueless tourist crowd won't know the difference if they get a FP for Toy Story or GMR so probably wouldn't know or care to try to switch.