I’ve sat on my back deck this evening and experimented with taking the stingers out, then putting them back in a series of Lee pipes.
A stinger noticeably cools the smoke and acts as a filter to trap heavy tars, which makes for a milder smoke.
I prefer the stinger out of the pipe, because it’s tastier.
But a stinger worked exactly as advertised. For a beginner or a smoker with a tender tongue they are much easier to smoke, with the stinger left inside.