I read this here all the time, and I just don't think every type of vacation is destined to be stress-free.
WDW is so large now and offers so much; 4 theme parks, 2 water parks, an entertainment/restaurant/shopping district and resorts like AKL that are destinations in themselves. People go for a week (some even longer) and want to experience specific attractions or events, such as fireworks shows, the newest ride or a popular restaurant with a specific view. They go with their families, who often have to accommodate the schedules of younger or older members. Itineraries are the only way these people are going to get a shot at getting what they want at a time convenient to them. Despite rising costs, the parks are full and these experiences book up far in advance.
We take at least two trips each year - some with just my husband and me and others with the entire family (currently expanded to 6 adults and 3 grandchildren under 3 years old). DH and I would book FP+ and ADR's in advance because we wanted to ensure that we could do certain things at certain times (for example, go to a water park during the day and then hit FOP, EE and KS in the evening at AK with Tiffins thrown in somewhere for dinner). But just about every vacation, we made some last minute changes, usually based on weather.
Our April 2022 trip with the family is going to be challenging, but I would have much preferred the old FP+, 180-day ADR system to whatever is being put in place now. You just don't "wing it" when it comes to making dinner reservations for 9 people. Disney long ago made the decision to favor the certainty of getting particular experiences to the spontaneity of last-minute choices. What I fear is that they have now come up with a weird hybrid of letting people make reservations (60 days out for ADRs and last-minute with Genie+) that will force spontaneity without the certainty of getting what you want.
We've been going to WDW since 1984, when you made dining reservations on the phone or at a kiosk in the parks and there was no line reservation system. We've never had a bad vacation there, and I've always said that the two things most necessary for success are a positive attitude and the flexibility to work with any system Disney currently has in place. This next year is going to test that concept, but I'm willing to give it a chance before deciding it won't work for us.