I will never understand people's dismissal of established artists wanting to move on and try new sounds. This was the 80s where, what now may sound like a too-soft style, was new and exciting. The synthesizers, the polished sound, this was all new territory in the 80s.
Also, Queen, Pink Floyd, Genesis, they all explored, and *defined* their initial genres, but they were getting older, and they probably didn't feel the angst anymore.
Queen still had weird and exciting tunes on their albums (unless "Chinese Torture" isn't weird enough for you), Genesis still bombastic epics (Domino, Fading Lights) and Pink Floyd their drawn out jams.
It's just that they probably felt trying to pretend to be angsty twenty-somethings (like some bands that I won't name here) simply wasn't who they were at that point.