>>58518996Fucking newfag. SAO popularized game skills and getting trapped in a game.
Mushoku tensei WEBnovel popularized the loser OTAKU dying from TRUCK-KUN and getting REINCARNATED into a generic dragon quest like fantasy world with codified guild system, adventurers, elves, dwarves, goblins, beastmen, harems and demon lord.
After mushoku tensei WEBNOVEL, not the LN, everyone and their mother started writing the same isekai slop webnovel that would get adapted later into Light Novels > manga/anime
Overlord popularized the "transported into the game world with game skillsets" so it was added on top of that generic isekai fad and new isekais were Mushoku tensei + game mechanics