If like most people and groups you plan your FP's at 60 days then you would bunch them up into about a 3-4 hour window, most times.
Then multiply that by thousands and that takes a lot guests out of the standby line and enjoying snacks, shopping..and A/C, mostly in the AM but if like me in the afternoon. Of course sometimes you can only get the headliners when you can get them....YRMV...
Unless you are a local AP and then your opinion is a bit jaded and not very enthusiastic about FP+ returning...![]()
Most people who have a fastpass for one line are typically in another standby line while they wait. Its a proven fact that people dont go to the parks predominatly for eating/shopping, minus maybe epcot. Fastpass allows people to attempt to ride more rides standby in a day, it doesnt push them to shop and eat.