especially the 3rd video shows pretty well, that many fps problems on the PS4 are CPU related and in those cases boost mode can show really nice gains - if however there is GPU related drops boost mode doesn't improve things that much, as it only uses 18 CUs @ 911MHz
but the fact that some CPU related fps drop show up even at PS4 pro clock makes me think that if Scorpio still uses Jaguar cores at a few MHz above PS4 Pro, then what it can achieve is pretty limited although it has a ~6TF GPU and more RAM etc