As has already been mentioned, I think it has more to do with the pipe material than the shape or filters. In my experience, cobs and meers just work better for tobaccos that will smoke wet or hot, as many aromatics do.
I don’t see it this way at all, and I’ve smoked a lot of Aromatics, and none of them were wet and hot. You can smoke Aros in any pipe you want.
If you’re getting Wet/Hot, you’re doing something wrong, unless it’s garbage tabac.
Drying, packing and smoking cadence are the most important, not the pipes.
I also don’t believe there’s such a thing as a wet or hot tobacco, it’s only understanding the blend you are smoking, then drying, packing and the smoking cadence that makes the differences.
Yes a lot of Aros can be quite moist, and a lot of people seem to think all Aros equal goopy, bringing about this wet/hot idea, but that’s also not true.
There are a lot of Aros out there, that have a nice moisture content like any other blend, and smoke no different.
Any blend you don’t dry out that is quite moist, and smoke fast, will be hot, and cause moisture build up in the bottom.
Remember, heat = moisture in the pipe.