Simple in the video provided by hifistud, there is clear evidence of both stressing the circuitry and battery when the load demands more than 2A. It doesn't shut off with an error message, provided voltage just drops until the unit is below 2A. Yes the unit is designed to protect itself, but placing an LR atty on the device knowing the LR is drawing too many amps is asking for trouble. Folks are going to want to do it and hence why Volcano IMO are just CTA. Look at how many vapers vape LRs on eGos which were never designed to handle that sort of demand.
Kudos to Volcano and if you do not like it, there is always the provari. Better yet get yourself a SB armed with an 18650 and use all the LRs and DCs your little heart desires, if ya need more heat throw in a couple of 3V 16340s and vape 6V. If that is not good enough, toss in a couple of 18350s and vape at 7.4V, that should get ya there