that’s just not true lol. sao literally started the whole ntr parody wave in anime (it’s known for that). there’s so much ntr fanart, doujins, even games around it (probably more than most shows combined). it’s to the point where if you see 3 sao fan things, 2 of them are guaranteed to be ntr xD
sao didn’t oversaturate itself, it stuck around cause it had real impact. there’s a lot of content, but that’s because people liked it. the romance wasn’t cringe either, it had more depth than half the stuff out now in today’s anime market as you said xD. it’s funny how the most popular shows in today’s anime market, like solo leveling, are basically second hand ripped off of sao with better animation and production value. sao set the standard, and now all these newer shows are just copying what it did (literally more than half of the isekais that airs nowadays xD). if you don't accept this, then it just proves you're contrarian and a hater who's following this bandwagon of hatred created by bunch of elitists kek