@NotALewdGuy he lived on the other side for a quarter of his life, or a third if you look at it that way. I guess that qualifies him as "Summoned to another world, and came back with unknown skills and magic, but it turns out my world was different now too" type protagonist.... Is that the current trend?
@CountryMage not the current trend, since there's still "stupidly dense OPMC with absolutely cheat skills that's been blessed by the gods" keeps getting written and worse, anime adaptation.
@solipsist
I have no interest defending bad storytelling and cliches, but you should at least know the differences in genres and established terminology. Isekai is from one world to another, method (resurrection, transfer, w.e) unimportant.
Fantasy is fantasy, specifying shonen oriented web novel fantasy is the overall style of genre. They all have similar tropes, isekai is just a single variant.