re: oversaturation, i do think it's sort of interesting how excessively online music/people can result in genre acceleration. obv "the egg sound" predated the pandemic. and i'm not sure where i read this (some review -- sorry state or something?) but seems like a lot of eggy bands like prison affair grew out of 2020 pandemic bedroom recording and digital idea swapping. so you get these bands all riffing on the same idea in germany spain australia usa. i wonder if the feeling that it's all unmoored is in part that overly-digital element.
and yes, all of this is further facilitated role that spotify plays in scraping forums (probably this one!) for genre ideas, compiling them into playlists, and then feeding them back to listeners. in the liz pelly book she talks about this wrt the "lo-fi beats" scene which feels really similar to egg insofar as there was a creative origin that quickly got ground down into its most derivative elements. as mentioned above, there is nothing particularly new here in the history of music. but the speed and scale with which it happens does seem to leave something to be desired.