thing is with most the high watt box mods, ideal optimization of mods power lies at 0.4-0.8 ohms. The beauty is can drive that range of build, at a safe amp, and get the same or better vape one experiences with a low, low sub ohm vape, while doing under 20 amps. When pushing under or over that target range, experience big voltage drop and negligible gain in vap potential.
Find optimizing box power constraints no less challenging than optimizing mech/rba restraints. If driving primarily 0.20 ohms or lower, there is no real advantage of going regulated. But, if one wants to experience high watt vaping at a reassembled amp limit, they can be pretty sweet.

Can drive a 0.71 ohm build at 100 watts, now that's like cooking with butter, or something like that.!!!!
Vape long and Prosper.!!!