Efficiency = applied power to vapor ratio.
The thick 30ga wrap doesn't carry any significant current, so the 24ga core has to do all the work. And as long as the wrap hasn't reached a high enough temperature, there's not going to be any vapor at all, so the ramp up time has to be compensated for with more power. It may be cool to vape at a quadrillion watts, but if the same vapor production can be achieved with less power, that build is just inefficient.
26*2/40 or 28*3/38 coils for example are much more efficient. You get a compareable surface area but at the benefit of a much quicker ramp up and cool down. The quicker the cool down the better the overall coil life will be btw.
Having 2 seperate coils on each side isn't very efficient as well. A single contact coil offers a better all around heat distribution, which again helps with ramp up, and which in turn again needs less power for the same results.
The magic with fused claptons i, that the coils themselves act as a kind of wicking. They have (more) cavities where the juice can settle in, so the effective surface area of the heating element is a lot larger than simple claptons or plain round wire builds, which leads to more vapor production.
All that said I do enjoy simple 26/32 or 26/36 claptons in my series mechs, but only because there's just no other way to reach my personal sweet spot regarding heat and vapor production.
With single cell mechs or regulated devices fused claptons work a lot better though.