The idea behind FP was to let the computer hold your place in line while you did other things, including (Disney hoped) spending money in the shops or on food.
From my perspective, the original FP was valuable for people who arrived at park opening. Later arrivals missed out on the really popular attractions, since return times were based on when you arrived at an attraction to get a return time, and all FPs might be gone by the time you arrived. FP+ was an improvement, since ride times were available before the trip even started, and your planned park arrival time was a non-factor. Genie is worse for several reasons. Among other things: it costs money, is less flexible, can only be used at the last minute, and runs on an online platform that is not up to the task. I don't want the entire concept to be scrapped - I just want a system that works.