I don’t understand the efforts thing. Dump the keystones until draft hole is covered, and dump activated charcoal until keystones are covered. Thats it. It takes 15-20 seconds maximum. When you dump the tobacco, take the keystones out of the ashtray to somewhere that it dries and can be re used and put back in the tin.
With smoking pipes, there is so much finicky stuff that we can collect (lighters, pipes, tools, pouches, wind caps, cleaning supplies, pipe racks, etc) and so many tobacco’s, cellaring, techniques on packing, lightning, pipe shapes and sizes, but having 2 tiny “keystones” tins, one for the keystones and the other for activated charcoal pellets, aside to filter a pipe is a lot of effort? A portable ashtray to dump the keystones if you are out and about? I can understand people not finding the purpose of it due to them not having the issues and such, but the effort thing is strange to me. Its really not that hard or complicated to use or even carry outdoors.