Hurr Durr Derp said:
A lot of text, and all you're basically are saying is "if the characters improve their stats, it's an RPG".
So I guess Football Manager 2010 is now an RPG?
When character advancement is the primary gameplay feature of the game, it is an RPG.
Footbal Manager's main feature is the simulation of managing a football team. Thus it is a sim.
Zelda lets you learn new sword techniques and gain new items, but that's got more to do with the story and to enhance the action and platforming sequences. Its generally labeled an action/adventure.
Final Fantasy involves fighting things, but your success revolves around how far your character has advanced, in terms of level stats and equipment.
Rather than there being J and W RPGs, I view them as choice driven, stat driven and free.
Choice driven - Focus on character advancement through choices during the story (still has stats for physical/technical/magical advancement)
Stat driven - Focus on achieving a level of character advancement high enough to tackle enemies.
Free - Generally focuses on stats but there is little to no story progression. Instead the focus is on creating your own goals and advancing your character to meet said goals.
Its probably not perfect since I'm tired, and they certainly can overlap, but this is how I see it.