Modern lo-fi bands like Yo La Tengo, Sebadoh, Guided By Voices and Mercury Rev all pre-date Pavement and they are some of the most popular lo-fi bands, so I'm not sure any Pavement album ignited it or had that much of an influence on it as there already seemed to be some sort of scene there, I may be wrong though.
not important just because there were grunge and alternative bands before it? More pointedly, is Spiderland
really important, considering that it is predated by Talk Talk's late albums, which sound far more like most post-rock has ended up sounding? Spiderland
is an album like The Velvet Underground and Nico
that is only important in retrospect. Unlike that album though, Spiderland
's title of being a founding post-rock album is complicated by not being the
founding post-rock album, but a
founding post-rock album along with a bunch of other albums that led up to post-rock being a kind of coherent scene which didn't happen until Bark Psychosis's Hex
(at the very
earliest). In comparison, Slanted & Enchanted
is pretty much indie rock's Nevermind
, only probably much more centrally important as an album rather than a document of a band that was important. Until S&E
came out, all the bands you mention tended to be seen as a scattered assortment of college rock leftovers that didn't have anything to do with each other. It's because of Slanted & Enchanted
's legacy that you even mention those bands in the same sentence. Slanted & Enchanted
did not invent lo-fi or indie rock, but it drew the aesthetic dividing line between the college rock scene of the 80s and the indie rock of the 90s and beyond, defining the aesthetics of the whole movement, and it's frankly a little weird not to have it as number one on this list. In The Aeroplane Over the Sea
is just a cult favorite gone popular in comparison.