I was underwhelmed by MaxPass. Being able to secure 3 FP+, typically in a row, allows one to plan their day knowing those 3 desired attractions are already locked-in. MaxPass was a throwback to everything that was awful about the original incarnation of FP: not being able to start ”waiting” for even a single attraction until you’re in the park, one FP at a time (or 2 hours between), limited availability for many attractions, few choices for ride times, increased likelihood of criss-crossing the park to redeem the passes.
When we used MaxPass on a fairly laid-back Tuesday last April, we ended up with Incredicoaster around noon, Radiator Springs at 3 and GOTG at 6. That lead to a lot of wasted time roaming the park, trying to kill time in longish standby lines between passes.
When I schedule FP+, it’s a logical progression like TOT at 9am, RNR at 10am (9:30 arrival allows for riding both back-to-back), then Toy Story Mania at 11am. Having to pre-plan is a small price to pay for the ability to get best use from our time. And as another poster said, making changes on short notice, even same day is easier than most seem to believe.