[panda]

I'm fairly certain this hasn't been the case until recent years post SAO and the popularisation of Isekai anime. Perhaps this is just me but honestly  fantasy anime ,even the Non-Isekai ones seems to be using RPG language like "levels" "skills" "party/parties" "quests" and stuff like that everywhere and the world templates seem to be way too overdone with almost everything feeling one dimensional like a game

[SmG Evzone]

It's just people trend hopping.  SAO grossed a lot of views, and other anime's are hoping to get a piece of the pie.  They are hoping to gross large amounts of money by hopping on what was once a popular trend.  Same with webtoons as well.  A lot of villianess webtoons are reincarnated for revenge are popular rn, but not a lot of them have fresh ideas either.

[SmG Ker0w0]

Well the first season of SAO has been out since 2012 lol, those terms have been used for quite a while, and well I wont deny its becoming more frequent it's probably just due to the popularity right now. Same with the villainess genre.

[Mohireza]

Trends come
Trends go
Only based shows remain
That's why 2012 was when the golden era of anime came to an end and they started copying each other