Diablo only barely qualifies in the ARPG subgenre? As in the subgenre it spawned? LMAO
Diablo series was excluded from the Codex Best RPGs of 2019 list, meanwhile action games like Deus Ex and Dark Souls were included.
Objectively speaking, Diablo is a lot like a traditional RPG, aside from the (imho unpleasant) real time combat. It has a lot in common with old roguelikes.
Yet the Codex ignores the Hack and Slash genre and seems to consider it "not RPG".
On the other hand, the Codex will count any console action game as an RPG if it has certain characteristics like story and atmosphere.
I blame storyfags.
Seriously. Diablo is far more of an RPG than something like Dark Souls. The fact that you can attack and miss with your stats impacting how likely you are to hit or miss should be evidence enough of that.