Pink Floyd and Prog Music

Hello, I've been a lurker here for a while and first of all just wanted to commend the forum for it's intelligent discussion (so many forums aren't like this). But anyway, I just thought I'd present my viewpoint regarding some recent thoughts on Pink Floyd. For some time, I've thought of them as one of the very biggest names in prog rock and I still do believe that, but I now find a shift in how I would label them. Of course, the Syd Barrett years are most definitely psych, but I now believe that Pink Floyd remained a psychedelic rock group all the way up through Dark Side of the Moon and didn't turn progressive rock until Wish You Were Here. Being quite familiar with their work (I have all their albums through Momentary Lapse of Reason), I don't feel like I'm making an uninformed judgment here. Now I love both prog and psych, and I realize, like so many things, that there is not necessarily a clear-cut line between the two. Dark Side seems to be the culmination of what came before as a result of their prior ongoing evolution. Everything just happened to fall into place perfectly however, which has probably led some to believe that it took longer to create. From comments by the band's members though, it was actually one of the quickest albums they did. Wish, on the the other hand, feels much more carefully planned than Dark Side which has a more free flowing feel to it. Even those first four opening notes of David Gilmour's treated guitar on Wish are an indicator of this - you can just tell there was a lot of effort to make each of those notes have the perfectly desired sound quality - and it succeeded! So in the end, I place Wish You Were Here as the beginning of Pink Floyd's prog rock stage while Dark Side of the Moon was the finalization of their psychedelic rock journey. Any comments on this?