How about a mouthpiece which makes a better connection into 14.4mm or 18.8mm glass on glass joints?
How about a mouthpiece which actually bloody fits any sort of tubing worth using?
The mouthpiece on the herbalaire is a drawback imo, one which could be solved with a minor and inexpensive redesign.
I'd also like to see a modified cruble, one which has "legs" so to speak, and is thinner than the herb chamber within which the crucible sits. This would in effect get it out of contact with the walls and bottom of the chamber, which are super hot and are constantly vaporizing your material whether or not you are inhaling. This would cut down on the completely undesirable, always-on conduction vaporization which this design is plagued with. I don't mean to sound harsh, it's just frustrating going from a vape with virtually no problems along these lines (Vapobowl, MFLB, Vapocane, DBV surprisingly) to ones which have the problem to such an extent that it defines their use (Herbalaire, Iolite). When I use the HA, which I basically use only for bags, I let it get up to temperature, then drop in my material and RUSH to get the mouthpiece/bag assembly on and the bag blowing as quickly as possible. I know that if I'm lazy and let it sit for 5 minutes before I do my next bag, the material will be seriously compromised by sitting idle in the chamber.
Edit: I guess Ergo's suggestion of "Main mouthpieces which in fact are secondary convection-only crucibles" more or less expresses what we need.
Edit: Lol, Egro, my bad. "Ergo" just seems so much more natural to my anglo eyes, I kind of get like selective, effective dyslexia sometimes, where in an effort to read something more quickly I take it at a glance and rearrange some groups of letters into ones which seem more natural to my lexicon.. Ya know?