Speed, but what makes speed most relevant for me is i also like to use a good unbroken chunk of moist material. When it isn't broke up and is moist you need that extra punch. I will rip full blast until i get a few big exhales, spin chunk with stick and get a few more really good blasts. I either than break down further and likely turn down the heat for a full extraction or just empty and start a new bowl. It doesn't take a huge chunk to do this.
Full blast once herb is super crumbled and dry, and heater is already warmed up must be done with a bit of caution, one would not be able to ride the throttle too hard.
Edit. This vape is super easy to use but may hold power some will have to learn to respect early on. Think LSV just much faster with more manual play.
Double edit
@bounce5. This device wont be for everyone but it might compare well to a battery Daisy or Lily. Combustion is possible, but can be easily managed with a little practice. The experience won't be right for everyone,.but some. (most) will tame the device and rave and use them as daily drivers IMO.