Well... considering that Crossbows, Levitation, Spears, Medium Armor, and more factions were all removed in Oblivion I don't think you could blame Skyrim for their removal. Attributes and Skills were pretty much condensed into perks as health, mana, and stamina were raised from attributes but weren't attributes themselves. Open lock spells are really useless as picking locks is pretty easy, and questlines feel shorter because travel is much easier now.
Quite simply because games with depth are not easily picked up by new players, and god forbit a bit of depth from stopping Bethesda from lining their pockets. Either that, or they think we're all just stupid.
Yes because competitive multiplayer games (such as CoD, BF3, StarCraft, and whatever fighting game) aren't deep? I'd argue that any competitive multiplayer game in this day and age has much more depth than your standard RPG due to the metagame involved in each.
Number 1 RPG series lol? This is barely passable. It's as shallow an RPG as you can get.
I didn't know skills and attributes made a game an "RPG". This is as bad as people complaining that Minecraft was turning into an RPG because Notch added leveling, enchantments, and potions.