I guess if you want to make a really good omelette, you had to break a lot of eggs in the process. At least these bands happened to have crafted some really great albums in the process.
Some others that come to mind that haven't been addressed in these lists:
of Montreal (pretty much the modern figurehead for 'large discog but ignored'; people act like Hissing Fauna is their only album)
Omar Rodriguez Lopez
Brian Eno (so much of his discog gets ignored)
Can (they didn't stop after damo left!)
John Zorn
John Cage (he did so much more than the only composition people ever talk about)
Prince
Every jazz musician ever
