a good hiphop dj will be able to do it all.......mix, juggle, skracth, cut an paste....the lot.

Ive heard plenty of good mixin/beatmatching from hiphop.

One that sticks in my head is qbert an MMM - they mix goldfinger(shirley bassy), a theme tune from a cowboy movie(yall know the tune if ya heard it), whilst skratching over it....brillient...

But the reason most dont beatmatch every track is cos how wants to heard 2 folk speaking at the same time....plus they would rather use higher skilled mixin processes.