So you feel someone with a
DAS should be able to hold 6 times at once?
You can't get regular tickets anymore. So no one can go get regular tickets. Everyone uses FP+. So any guest entering after an attraction is 'sold out' for the day is out of luck. I would count yourself lucky that you can get attractions such as TSM even when sold out for the day. You could easily schedule 3 other attractions using FP+ then immediately get a TSM DAS time when you enter the park and then do the other attractions while waiting for your TSM time.
I'm really not seeing your issue TBH. If pre booking is that important then at any time in the last 7months you could have booked a single night on site and gotten bands for everyone and had the ability to prebook FP+. It was that important to us so that's what we did. At this point there really isn't much benefit to do that for you since AP MBs/advance booking will be rolling out soon.
We've had the new DAS since it rolled out and this has always been the way it was setup from day 1. It actually works extremely well and me saying this is pretty big since I was completely freaked about how YDD would deal without instant access and the ability to loop rides.