Depends on context.
I really don't buy this "Morrowind is RPG because shit combat while Dark Souls not RPG because good combat", I get the point (stats more or less important) but I think this adds nothing to the discussion, in my opinion if you think the RPG label is only about character sheets and different possible builds (this "with RPG elements" thing) then Dark Souls is good at that, much better than many other games.
The thing is, if the point is whether I'd prefer if games like Dark Souls, or any action-rpg for the matter, appear when I browse Steam for games with the RPG tag, then I'd highly prefer if they don't appear. I prefer about RPGs being about being close to the games which made the genre. In that case RPGs are just as identifiable as plateformers, just like a game which looks like a plateformer is more often than not a plateformer there's little chance a game which looks like that is not an RPG :
The genre became a genre for a reason. It's also my favourite genre for a reason which can't be that different, and it's really about party adventuring, and to simplify let's even say creating my own party and adventuring, and also in the details all these games play quite the same.
Reducing the genre to having a character sheet or not does not work for me, that's not what makes a game appealing or not to me.
Based on what used to sell a lot of players thought the kind of games I'm talking about were what was a fun adaptation of tabletop RPGs to a computer back then.
Now I am aware it's more complicated. First what some players who used to play the classic really wanted to play was Ultima Underworld, Diablo, WOW or Skyrim and they switched to those, I can't deny that, but I think these games are far enough from the roots that they can be called something else too.
Secondly, many devs have different interpretations of adapting tabletop RPGs to computers, and after all the classics were not all the exact same either, devs also came with different ideas, but we must also judge the final result, if the game plays like any action game out there then whether you call it an RPG or not is totally irrelevant, if it plays like classics then no problem (in definitive it's not only about a party, I've no problem with Underrail appearing when I check for RPGs), if it's its own thing then I don't have an opinion beforehand but don't assume it's the kind of game I could like because you call it RPG, it has a character sheet or something like that.