i'm GLAD those spells are removed, because it offers more incentive to play a thief in the first place. No character should be able to do everything, at least in my opinion.
This. It makes more sense and differentiates character builds. I mean, why specialize in lockpicking at all if you can just learn spells to cast on the locks?
Nothing quest critical is going to be behind a locked door you can't get a key to.
1, You can ask some NPCs for keys
2, You can kill NPCs for their keys
Besides, all you usually miss out on are usually some gems and other little treasure. They don't lock massive awesome areas on you.