Convection or conduction. Who cares? This isn't a hot plate vape, where you have to flip the herb like a pancake to get it cooked on both sides. The herb sits in a contained bowl and gets heat from contact, so of course there's some conduction. But the design intent is to draw hot air through the bowl/heat chamber (and certainly not all the herb is in contact with the sides of the bowl), and it works well. Slapping a label on it that says conduction isn't going to change that. Unless you buy an old fashioned crappy dome vape, you're getting good vaporization performance with modern designs. All these questions about conduction or convection are meaningless. If the vapor production wasn't good, and design efficient (which it isn't on dome vapes) then the vape wouldn't be selling and getting good feedback on the forum.
I've used two DV's enough to know that setttng the temp to 385-390 turns the herb very dark and fully cooks it. Going by color and taste (if it's got the burned popcorn taste it's done) is a better method than trusting a temp setting, so I continue to be surprised that users want to push the temp setting up above 400. IMO you'd have to sucking on it really hard with every hit to avoid overcooking with a 400+ setting. Starting a bowl at a 400 or so setting is going to roast the bowl contents in a hurry and ruin the taste. I start getting vapor at a setting below 350 and never start higher than that. It's an easy design to bump the temp up as you go- one degree with every click. I usually move up 5 degrees at a time. The bowl lasts longer and the taste is better.