I do believe it's time for a Doraemon thread

Is Doraemon series including episode, manga and movies an Isekai? Any arguments?

The only time doraemon become isekai was when what-if box was used, like in the Adventure into The Underworld. Otherwise everything is happening in the same universe regardless time and place.

Kinda explain the changes in storyline and the more apparent "shonen-ish" trope.