Not to pose as an expert on temp control---since I'm just another lab-rat user with limited knowledge of the technology---but it seems to me that applied wattage (from relatively low to very high) provides only a single variable in temp control as currently implemented in most TC mods: Wattage determines only one thing---how quickly the coil will reach the specified temperature limit. Low watts = slower ramp up; high watts = quicker ramp-up.
At 40 watts, a given coil might take a pull or two to reach a moderate temp limit, say 420° F. At 100+ watts, that same coil will reach the set temp limit much quicker. Depending on the temp setting, the coil could heat up to full temp almost instantaneously. At least in theory.
In real-world experience, I've had better luck personally by keeping the wattage lower rather than higher. With some of my nickel-coiled atties/tanks, the vape at higher watts (50W+) sometimes tastes "harsher" initially, while lower watts (40 and less) often provides a "smoother" vape. Set the watts too low, and the vape becomes anemic (i.e., not enough impact). I generally stay at 40-50 watts, although I have TC mods that will go much higher. YMMV, of course, as too many subtle variables exist to make blanket statements that will apply for everyone.