ResidentLeever: The way you're talking about Adventure games seems to go against the idea you had earlier that metroidvania was useful because it's mechanically specific.
Why? Those are two very different genre names, "adventure game" is a much broader term, while "Metroidvania" is a rather specific term for a subgenre. I never said all genre names are equally useful or that they all have to be about the mechanics. I just pointed out that these terms are not descriptive but historically evolved, regardless of whether they sound fitting or not, they are in use that way.
ResidentLeever: Games in general focus on storytelling now to the point where Adventure is more useful to describe the games that do this but also adhere more to the older mechanics of that genre, since there's also RPGs fo fill this storytelling role with interactivity of varying degrees.
Not in the way I described. I was saying that the story is the main focus and other elements are nearly excluded or insignificant, in any case rather secondary. Tactical and/or action oriented elements still play a big part in RPGs, even if they're story-oriented. In adventure games, progressing in the story is the main gameplay element, not an accompanying one. In general, that is, because you are right in that this definition is not 100% fool-proof, since puzzles often play a significant role in adventure games, too (although I wouldn't say it's a defining role, adventure games don't necessarily need puzzles to be considered adventure games in the broadest sense). And then there are various subgenres, Text Adventures, Point-and-Click-Adventures, Choose-Your-Own-Adventure, personally I'd also consider Walking Simulators a subgenre of adventure games, and maybe even Visual Novels.
Of course, in the end, the borders between genres are often fluent, and no definition will ever be satisfactory in every regard, there will always be elements that don't really fit the description, which is why I think there's not much point in debating these definitions for long, as if they were set in stone. They're just there to help, not to dictate how you should speak about games. Your opinion on these things is just as valid as mine, I'm just trying to write down my personal thoughts on the matter. :)