+1 to highlighted in red. Most mechs have a considerate amount of voltage drop a regulated box mod overcomes with kicking up the voltage. Example, by calculations of "Ohm's Law" if no voltage drop is present, the mod and atomizer materials were perfect conductors, 4.2 volt fresh charged battery at 0.14ohms (max continuous for a Sony VTC3/4) would be 30amps at 126watts, even with a 7% voltage drop to be nice, voltage reaching the coil would be 3.906 volts, same ohm rating of 0.14, you are now down to 108.98 watts at 27.9amps. Trust me, side by side, my authentic brass mod with silver plated brass contacts, by calculations, same atomizer, same ohm rating, put that atty on the mech and then on my IPV V3 set to 120watts, the output of the IPV V3 is 25% to 35% higher than the mech supposedly putting out 126watts just by the Ohm's Law calculation. Crank the IPV V3 down to about 85watts, and that is about where my mech feels to be outputting. Unless you are running in a stacked top to bottom tube setup or side by side series like in a box mod, which max output would 8.4volts from the batteries, a regulated high wattage box mod is still going to smoke a mech and keep the wattage output just about maxed dead on most of the charge of the batteries. Another downside on the mech, as the battery looses charge, wattage at the coil lowers as well
Not saying Mech or Regulated one is better than the other, they both have their strengths and weaknesses if you know what you are truly doing, as I own both, and learned a lot of my high wattage knowledge on mechs before regulated mods started hitting 30, 50, and 100watt settings, still use both types of setups.
Mech
Simple and relatively easy to use
Pretty consistent vape most of their charge
Simple to maintain or repair
Require a lot of technical, safety, and theoretical electrical knowledge
Regulated
Consistent vape full duty cycle of the batteries
Easy to use, most times set and forget
Harder to repair
A lot more built in safety
Require a lot of technical, safety, and theoretical electrical knowledge