trub in your carboy is not really a problem in the sense that it does nothing bad to your beer. avoiding putting trub in your beer is not a problem either if you are inclined that way but i'm just saying you are not avoiding anything except putting trub in the carboy. when i use whole hops it sometimes clogs my drain valve so i just dump the whole kettle into my fermentor and i get the same clear, tasty beer i get when i don't get trub in the fermentor. that trub is also a nutrient fr the yeast so it may be beneficial to have it in with the beer.