I don't let things go, even when it reaches a point where I begin to look stupid and obsessive. Although there is no very distinct levelling process in Zelda, there still is one, everytime you go through a dungeon. An upgrade, a heart container etc etc.
The idea of Zelda is that they are all different realities of the people from the original series. Final Fantasy does the same thing, but with different characters and different worlds. Al the items have similar names, all the magic have the same names.
While it's true most of the characteristics you named make up a typical conventional RPG, when you mentioned turn based as an attribute of RPGs, that's the one that is making me still argue with you. There are god knows how many RPGs that do not have this type of system, I'm not too sure, but Ultima I didn't have this type of system. The idea of RPGs is far too broad for you to say what should be an RPG and what shouldn't, the truth is, imo, the majority of action adventures are RPGs. You follow a storyline, you have a role to fulfill, quests are to be completed in a party system or a solo gameplay system etc etc. The differences in gameplay are practically neglible, and most RPGs are defined in the way you said, with a Turn based combat system. But that's just a conventional view, not a real view of what SHOULD make an RPG an RPG. That or there needs to be a different genre for games like Final fantasy, like turn based action or some kind of strategy action. Don't even know why they gave it such a vague name like Role Playing Game anyway...you play the role of a character in practically every action adventure...