Well not everyone in Oblivion liked so many Spells and Junk in their Inventory, so are you gonna keep Everything in Skyrim. All 20 Shouts and All 200 Spell.
I see what your getting at. I'm not sure about shouts, we'll have to wait see how essential they are to the main story, considering you use dragon souls (which get stored) to get them, you could just get the ones you want and leave the others.
As for spells, it seems they are trying to cut down on the amount of junk spells. From what I gather, there is one spell for each effect (where it makes sense), so if you find Fireball early on then that will be the fire charge spell for the rest of the game. It just get's stronger as you play, so early on it might cause low damage, tiny AOE, but then at 100 destruction it will cause huge damage with a large explosion on contact, if you get what I'm saying. This way they don't have to have: Flameball, Fireball, Greater Fireball, Master Fireball and so on, clogging up your spell list.