I thought bookshelves were an improvement indeed; Skyrim did improve many mechanics and simple flaws.
If only there was one single house with enough bookshelves, and if only most of them werent bugged.
No, this is most certainly not an 'improvement'.
In Morrowind, I could decorate. This was a feature enjoyed by such a lot of people that it was not uncommon to find galleries full of screenshots of what people did with their houses.
That there were lightsources you could move around only enhanced that.
Oblivion?
No more candles or lanterns to highlight something. Every little thing had its own physics and pushed everything else out of its way. It was a nightmare.
Skyrim?
Completely impossible. Clutter respawns, the physics is so ramped up that items literally launch themselves and there is no way to position items.
Absolutely unfathomable that this was put in the game the way it was, considering how big decorating was for a lot of people.
But thats indicative of Skyrim as a whole I suppose. Unfinished, rushed, bare-bones and a boatload of popular features gone without any reason.