Im just wondering how Kurts songwriting and riffs changed drastically from the two albums,
nearly all the songs in Bleach were drop D riffs and heavily distorted but in Nevermind it sounds like a completely different band
All albums sound different or have a different feel (at least they're supposed to). It's probably just that a lot of Melvins and Mudhoney influence really shined out on Bleach. Songwriting changes throughout a musician's career.
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You just answered your own question.

Also bands that aren't mainstream as hell tend to release albums that sound different from one another. Not like it's that weird or anything.
Q: Favourite Pink Floyd song?
A: The one where they get wicked high and play Emin and A for an hour.
That's what we call 'Progress'. And it's good.
"(...) My hope will be in Zion, as I strife through a world so cold..."