I think Paul had been changing how the way he would improve or he already reached the peak for his certain style before.
He also said that the Vibrato album was supposed to be entitled "Pronghorn," wherein he explained that the american cheetah is already extinct and the only fastest land animal (in the west only, cheetah's are still alive in africa), i thought he would still have shred songs on the new album.
On the new/recent instructional videos or interviews, he keeps on telling that he is very sorry for introducing fast guitar stuff since the start of his musical career. Though it really had inspired/motivated others to play fast it really true to most guitarist also that playing good is playing fast.
Lately he's just into riffs that are percussive, I think he just want the licks to synch to the beat or groove of the songs.
I am not also sure if there's a change in style due to the addition of his wife keyboard playing.
Scarified is not scary lately when they are playing it.