Look, the one true innovation of rock music was the idea that you could convey raw emotion and energy through music, that's it.
The more technical viewpoints of music (instrumental virtuosity, harmonic/melodic innovation etc.) had already been refined by classical and jazz musicians for years and years. Then prog rockers sort of came along and thought to "give those things a go", while in reality, no rock musician can outdo classical composers in terms of innovation or musical complexity. And while i like most of the bands you mentioned, i still think that prog is in a way a dumbed down version of art music.
Now Stooges on the other hand tried to do something completely different. They knew what the strenghts of rock music were and elaborated on them creating extremely fascinating albums.