First of all your entire comment is only true for about a third of the year, which was the busiest time of year. The rest of the year, it was quite easy to pull FPs in the evening, even for headliners.
Secondly, the bolded is what makes your take ridiculous. Really, if I FP+ Epcot in the evening I can do "the things I really want to do" with FPs ??? TT and Soarin ?
If I head to HS can I grab TSMM, RnR, and ToT ?
If I go to MK can I FP Space, Splash, Thunder, AND Buzz or ... any of the other rides because 3 FP in MK isn't enough ???
See that's the thing. People like to say you can "FP+ the rides you really want to do ..." Except you can't, in 2 parks you have to choose BETWEEN the rides you really want to do, and in one park there simply are not enough FPs for the park. As for AK, well, we do Safari, EE and Kali, everything else is bonus. Of course, we also used to be able to FP those multiple times.