I always draw on the freshly packed bowl to judge the draw before lighting. Many times I get a small piece of tobacco that pulls through, but never any after that. I am careful to never stir my tobacco at the end of a bowl (I will gingerly dump if necessary) to avoid the ash, and then I never get it. The only filter that I want to taste is the tobacco in the bowl. A filter will change the taste and the smoke. We strive for the perfect blend, why add a flavor?!! We strive for a straight and open stem to avoid condensation, why disrupt the flow and virtually guarantee it is not laminar - even if the filter does not allow the moisture all the way up the stem? Why put a plug in the way so that I can't pass a pipe cleaner? And finally, why add complexity and expense?
After all that, use a filter if you wish. We all enjoy the routine of smoking differently and you do what is best for you. I personally avoid filtered pipes for all the above reasons.