Personally my first thought hearing āRPGā is the classic game with various characters, skills, level system and tons of enemies, but thereās a lot of games that donāt fit this definition that are still RPGs
I'm not sure if I want to go into the full thing because people tend to get defensive about their preconceived notions and make a big, heated argument about it. But I will say this: game genres are defined by gameplayā not by content, by visuals, by storytelling style, or by similarities with other games people assume to be in that genre.
So the biggest problem with humans and categorizations is that humans are highly assumptive, seeing surface-level features and defining items by those, and defining items by outward similarities with other items that they already assume to be of that category. Because of this, what a lot of people do is confuse the adventure genreā games that use exploration, puzzle-solving, and key items in order to progressā and role-playing games, which almost always are adventure games as well. D&D? Both RPG and adventure. Final Fantasy XIII? RPG but not adventure. Zelda? Adventure but not RPG. But in most cases, RPGs are also adventures; so a lot of people through association mistakenly think games with common adventure elements are simply RPGs.
I know a lot of what I'm saying is going to fly over many peoples' heads, and they'll go crazy in the comments. Let's see how long I can ignore them for the sake of my own sanity...
I can imagine not considering the first Dragon Quest an RPG would create a lot of discussion, I canāt really speak for that since I havenāt played it but I guess some of the ācanonsā mustāve been missing since it used a password system.
Would Dark Souls count as an RPG in your definition? Thereās no definite classes but youāre definitely shaping up your character to be a Warrior, Mage, and so on.
I added Dark Souls into the list before I saw this comment; because usually when I talk about this subject, I list it. I try to use variety in my examples, but I just forgot for a moment about listing Dark Souls ^^
Wikipedia is written by humans, a.k.a. non-objective people, which is why they call it "duodecimal counting" instead of "dozenal counting" and used to have Talk wars on that page about it. The irrational side won.
If a game has classes like I said before, then it's a class-playing game, a.k.a. RPG. Something can be a roguelike but not an RPG. Also "roguelike" is a pretty dumb name for a genre and itself causes a lot of problems, but I digress.
Itās just one of many genres/subgenres that has one groundbreaking game/saga as origin and all the games that took inspiration from it, like Metroidvania or Soulslike. Just creating a new term for each of them would make initial discussions much weirder, although it would probably be clearer later on (nowadays most people that know what a Roguelike is donāt even know āRogueā is an actual game)