I concur with Jord, what does a toaster do that a grill can't?
Nothing that's what.
I only ever use my toaster for Pop Tarts that's literally it. I actually prefer doing toast on the grill cause you can put the toppings on and grill them for a bit too.
Microwaves on the other hand actually have a unique function in the kitchen and are useful doing something nothing else can do.