I agree with this in that I don't think even distribution of Fps was the driving force behind FP+. I think (and this is just conjecture on my part) the MM+ initiative "swallowed" up the FP program. Kiosks spitting out little strips of paper? That's so 2000. Now you can just tap your band! And all the attributes of the system were designed to allow this to happen. Three FPs was the magic number that would allow the system to work since they expected more people to use it than FP-. I don't know why you have to pick 3. I don't know why they were able to add the additional ones at the kiosks, unless less people ended up using the system than they expected, or they were able to designate more Fps per ride than they had intended. I don't think 4th and beyond will ever be available on the app. The kiosks act to slow down the use of additional Fps, and they seem to be reducing the number of kiosks even further.
So if I believe all this why do I still like the system? Because I rarely pulled more than 3 FPs before, so there's very little lost to me in that respect, however the preplanning is a huge benefit to me, so my experience is net positive. I am enjoying other aspects of the resort besides the four major parks, and no one attraction is make-or-break for our family. The kids are just as happy if not more to go on a Pirate Adventure Cruise and spend the rest of the day playing with their "treasure" and swimming at the resort. My husband is just as happy chilling at the resort, especially since we own DVC and are staying at those resorts. I plan out park days because I enjoy doing it, not because it's necessary for us to have a good vacation. Others will obviously have different experiences, but I can't be the only one who enjoys WDW vacations in this way.