Is it? Think of the scrolls, wands etch, equipping the various weapons what big effect in the gameplay they had.
... and consumable items still exist in 4E.
You are really claiming that being able to use wands and scrolls is such a huge part of the BG experience? Really?
They cant have the same effect in the 4e. 4e has its own things to track and manage in tactical combat that BG did not have. If you mix the two I get the feeling that you would make a very overwhelming game, gameplay wise.
Nonsense. They didn't overwhelm anybody then, they already exist in 4E, and noone is feeling particularly overwhelmed now.