I think his point was that if you use a product you put in your mouth many times a day, and can't be arsed to clean the chamber, maybe you aren't all that concerned with what you suck into your mouth or your lungs. (Don't mean to put words in his mouth, that was my inference....but it's a pretty good point actually.)
I kinda see both sides of this. One hand, SB owes its customers the full attention to anything that could impact health. OTOH to my eyes it's not obvious that the action of removing/replacing the chamber is really generating any metallic dust on the heater ring (doesn't look like it on mine, but then, I haven't used mine a ton). It also just doesn't look like it's in the airpath to me.
I do think somewhere between concern and complete panic is the right territory here. SB should definitely address these concerns...if there's a problem they should fix it. If there isn't, they should demonstrate why users should have faith in the Plenty. I personally am not too exercised about it, but again, I haven't used mine a lot and I can understand the skittishness given the crap flying around the world of vaping and health these days (most of which, to me, is complete nonsense and hysterics, but that's just me maybe....).
OK that was funny!