Back in the day, everyone it seems was trying to come up with their own way to get a "dry smoke", hence stingers in every shape and size.
I collect older Kaywoodies, which as mso489 mentions, have a built-in stinger. A lot of folks cut them off at the ball, so they will pass a cleaner. I keep my 4-ball stingers intact as I think that helps maintain the value of a collectible Kaywoodie. I think they smoke just fine with them, if you don't smoke to hot or fast (which we shouldn't do no matter the pipe).
Even Dunhill, Comoys, etc., had their own versions, with straw type tubes which could be easily removed.
Back in those days, the most common tobacco's were goopy aromatics, so I can see why a "dry" smoke would be desired.
With the bulk and variety of good tobacco blends we have available, that really renders stingers to the dust bin. Of course we still have "filter" pipes, which are very popular in Europe.