That's not consistent with my recollection. At all.
The list of tiered attractions pre-covid was:
EP: Soarin, TT, Frozen, fireworks viewing
HS: Smuggler's Run, Slinky, Runaway Railway
AK: Navi, FOP
That's 9 attractions total. 8 if you eliminate the fireworks viewing. My recollection was that with FP+, you pretty much had to structure your trip to hit one of these per day. With the typical weeklong visit, you had the capacity to schedule most of these. (Back then, FOP and Navi were so popular that it was a crapshoot as to whether you could even get 1 of the 2 when visiting AK.)
Over a 7 day visit using (free) FP+, you could schedule Soarin, TT, Smuggler's Run, Slinky, RR, and one of the Pandora attractions, with the 7th day reserved for MK.
MK had no tiers. If you were lucky enough to get Mine Train, that could be added to Space/BTMR/Splash for a rather complete day. And MK was the park where it was easiest to add attractions later in the day. Yes, it's conceivable that one could ride 3 HS attractions early in the morning with FP+, and then pick up something like Space or BTMR that evening. (Again, not tiered attractions.) Adding the tiered non-MK attractions as a 4th FP+ was rarely possible.
I'll say this for the tiers under LLMP: they are a double-edged sword with some benefit. Limiting everyone to booking just 1 from that group means there will be a lot left later in the day. But that also means the advantage will remain with the early risers. No, you don't have to get up at 7am to start booking anymore. But if you want the best shot at getting a second or third tier 1, you better be in the park by 8-9am to use that first pass.
I don't see a world where people can pre-book their LLs for 6, 7 and 8pm, and still have a great selection of options after using that 6pm LL.
If these changes resulted in the same number of people buying LL each day, then theoretically those users would have a similar experience to what
Genie+ is delivering today. But Disney is making these changes to increase the popularity of LL. If the number of paid users doubles, everyone gets a lesser experience. We'll see...