Here's my theory about how the Twin Cooling feature will make the rider feel more comfortable...
Water is 3600 times as dense as air at sea level, and can absorb much more heat much more quickly than can air. So, the liquid coolant can remove a lot of heat from the heads very quickly, in relation to how much heat air can remove in the same amount of time.
OK... but that absorbed heat has to go somewhere... and on the twin-cooled bikes it goes out the vent on the outside of the fairing lowers... right into the AIR surrounding the rider's legs!
The hot coolant goes from the engine through the LEFT fairing radiator first, then over to the RIGHT radiator. This means that the LEFT radiator will radiate MORE heat than will the RIGHT radiator, since it receives hotter coolant directly from the engine.
This left-to-right coolant flow will serve to EQUALIZE THE ROASTING of the rider's legs! It's BRILLIANT! Now, instead of only feeling the heat from the exhaust on their RIGHT leg, the rider will now also feel the heat from the LEFT - and hotter - radiator on their LEFT leg.
My theory is that with this new Equalized Roasting feature, the rider will PERCEIVE themselves to be more comfortable... because they will now feel the heat on BOTH legs, and neither leg will feel noticeably warmer in relation to the other leg.
It's psychological... rather like putting a frog in a pot of water, then heating the water until it boils. The frog won't jump out because it doesn't notice the gradual rise in water temperature surrounding it. But, if you throw a frog into already-boiling water, it will jump out immediately, because it quickly senses the significant temperature differential and takes quick action to save itself. Or something...
Anyway, that's my theory... Equalized Roasting!
Ken