Simplifies, yes. To the point where it's not really multiclassing. It's just gaining another power unrelated to the class, if you see what I mean. Taking a feat is that gives you another class' power is hardly multiclassing. A fighter with fireball is hardly a multiclassed fighter - he's just like a 3e fighter with a Necklace of Fireballs. Having one or two powers of a class doesn't, IMO, imply multiclassing. I think the only real multiclassing you'll find is in the paragon path. I just wish they'd included that bit rather than this 'thing' they call multiclassing which isn't really at all.
Pinotage