Saeviomagy
Adventurer
I see this the other way - items in 4E are ultra-specific, and very, very many builds - in fact most - depend on a specific set of items to work. Thus we get wish lists and such. Denying a player the magic items his build is centered around nerfs many, many concepts.
I don't think this is actually true. There are a very small subset of items that fall into this category, and a small subset of builds that rely on them. Most builds just benefit from certain items to do a little more of whatever it is that they do (and that is usually damage).
Typically the builds that need certain items to do whatever they do are exploiting odd number niches of the game (the most common of which are "dealing excessive damage in some wierd way" or "making an effect unsaveable"), and frankly they can sod right off.