You can flame your throat with 6-7 watts (just let your wick run dry), so what's the big deal with vaping at mega watts?!?
There is no such thing as efficiency when ya need 3-4 18650s & 30ml of juice to make it through the day.
Efficiency is when ya get the nick-TH-flavor that is desired at the lowest possible settings.
When you can get the vape ya want at 'sub AMP' instead of sub ohm THEN ya will have something to brag about.
There's not too many people out there who particularly like the vape you get from a wick run dry I don't think. So logically, it must be that vaping at "mega watts" doesn't flame your throat, at least not if your wick is kept wet, saturated, and your coil's total surface area is big enough, and your airflow type is both strong enough and stable enough, and also is focused onto the coil directly enough. My throat isn't fireproof. So if it works for me (it does), it must work for others who have tried to do the same. In fact the primary reason why I tried it is because others had already successfully done it before me. So there's no big secret. It's just a bit of applied science, no black magic there. Cooling effect is provided by airflow in cohort with evaporation in cohort with surface area. But of course designing your coil such that the numerous small cavities and crevasses in it will create a strong enough adsorption effect to, during the evaporation process, keep juice flowing fast enough from the wick into the coil will help also in addition to all this. Whether you like or don't like such a powerful vape is entirely up to you to decide, though. Personally, I, don't see myself vaping like that all day long TBH. But variation is the spice of life.
I once vaped ~40ml of 0mg juice in just a few hours time. I'm not saying this because I want to brag about it, but the flavor and especially the feel of the vape turned out to be pretty awesome.