No disagreement from me that there is perceived value in FPs for hard-to-get rides (and thus perceived value in an advance system if that increases your odds). If there wasn't value, very few souls would be buying Ultimate Night of Adventure tours (FoP), EMM (7DMT), and FEA dessert parties. But that's also the thing - the value of the current FP+ advance window already is questionable if you're only doing it for those rides - there's no guarantee on those even now (better chances, sure, but still not 100%) and probably shouldn't be a deciding factor in on-site/off-site if your shot at those is the only reason. Increasing the pool won't make it easier for the top rides, but they're already hard to get as it is. But value is subjective - I wouldn't pay for EMM or the AK tour, but others do and seem to be happy with that option. Same for staying on-site for the FP 60-day window.
Curious, too, what happens with SW:GE - of course, I have no proof but believe that FoP FPs have been throttled to manage the stand-by line and spread guests out (no secret that FPs are part of queue management across parks). Won't surprise me in the least if FPs are extremely rare or nonexistent for SW:GE for some time after opening.