Yeah, lets not focus on any on the improvements, and base our opinion only on what your subjective standpoint on what an "RPG" is.,, totally makes sense for a debate.

If a game series goes from being a really good open-world RPG series to an action-adventure series, it really doesn't matter to me how much of an improvement the action is. I'm not going to be happy with the change. If I wanted an action-adventure game, i'd buy one. When I buy TES games, I expect an open-world RPG.
This isnt pre-2000 anymore. Dont define modern RPG to what used to be. Simplifying is the video game industry evolving, whether you like it or not. I don't need dice roll combat and skills affected by numbers. That never made an RPG an RPG for me. I always found it cumbersome. RPGs, to me, is the element of building a story behind your character that you created, exploring another world, finding and crafting unique items and content, and befriending friends and foes. Skyrim does all this for me better than any RPG Ive ever played. I've played top down, side scrolling RPGs, graphics arent important, and numbers dont tell a story or define my characters for me.
If you want to assume the role of a character without all the stats/numbers, and run around exploring a gameworld, finding items, interacting with NPCs, progressing through a storyline, etc. you can do all of that in an action-adventure game.

And you realize, all TES games character creation basically have the same cause and effect. Daggerfall only had 8 attributes that each had its own selection of a handful of governed skills. If you put points in those attributes it would only raise those handful skills it governed, and you would be weaker in other attributes/skills(no matter how often you used those other attributes/skills, so it never made sense really RP wise). It really wasnt that deep before. Skyrim has just simplified it into just skills which has a handful of governed perks. Sure, they substituted a couple skills from previous iterations, but nothing worth changing your emotional balance and cause you to be judgemental over each new development.

I never play as a magical character, so perhaps Destruction is obsolete. Just use bows instead for ranged attacks.