I tried to keep this clean, but it may have turned into a rant.
Everybody has stated satisfactorily why there is risk of combustion and why it isn't a problem. Everybody has successfully stated the importance of the knob with adjusting temperature.
I could go into the Crafty thread and start the same argument that they don't have temp controls even though they technically do. The Prima and Firewood technically don't have em either. If we're arguing for the sake of arguing, my Extreme Q with its shiny buttons and digital display that shows a temperature doesn't provide temp control either; it skips numbers and it's not telling me what the temperature is in the chamber itself.
These all provide a range of heat that you can set based on your experience with the unit; sounds a lot like temperature controls to me. I can also combust with pretty much everything I've used except the iolite.
Using the EQ as an example, the numbers are only a placemarker to me. Bag fill requires higher heat (and different numbers) than a whip. I assume different positions on a knob would provide me with a similar ease of a reference to desired heat.
On the other hand, I could argue that the iolite and Firefly have the ability to control heat by draw speed despite operating at a fixed temp. Any of the vapes I've stated can also control the heat based on draw speed. I can accept people's argument that a fixed temp isn't good enough for them, but it works just fine for me. I'm trying to illustrate that temperature controls are not a rigid technique.
Also this.
http://www.rastabuddhatao.net/temperatures
Notice how at three settings, you can create temperature ranges with several factors.
Part of being on a thread about a certain vaporizer is discussing how it works. I would assume that the standard parts allow us to share experiences with different settings. I had intended to wait until we started getting production parts to bring this up, but I want people to share their general experiences with knob settings and the temp ranges they could represent.
I plan on marking mine with notches to represent fresh stuff, dry stuff, wet stuff, old dry powdery stuff, etc.