>>281508424
>>281508493
>>281508582
>>281508669
>>281508686
>>281508795
JUST look at the first few isekai from the 2010s.
Log Horizon is based on MMOs.
Overlord is based on DnD.
Knight's & Magic is based on older isekai/fantasy/mecha.

If we look upto 2013...
Re:Monster seems based on some kind of TTRPG, dunno which ones.
Dunno what MT is based on.
Shield Hero is a mish-mash of different settings because of very different nations and then again very different world-realms with power-systems for the legendary weapons that are based on different types of video games.
Re:Zero is the one single example that ZnTfags always bring up because it's the sole author who said to be inspired by it.
Slime is based on 3 different TTRPGs: Sword World, GURP and Wizardry TTRPG.

Soo... where is the "overwhelming" DQ influence?