You must have lived through a different 1990s than I did. "Hippy dippy schmaltz" was how I described much of Oasis music, IMHO, without what they got from the Beatles, they would have had virtually nothing interesting at all.
.And, IMHO, Oasis was far from anything "edgy". You want edgy from that era, you need to be looking at stuff like Bjork/Sugarcubes, Radiohead, the Flaming Lips, early Beck, Nirvana and many others.
And, I hear PLENTY of Sergeant Pepper's and White Album influences in Oasis' music, too. Many of the rhythm patterns in "What's the Story" songs came right from Ringo, from those albums...
Regards,
Gordon.