sure, but that's why there are multiple vents? and you can run the a/c at a lower speed to boot.

Two cold spots are not better than one. If you're claiming that the approach you describe is more efficient, then I agree with you. But for me the 'vents pointed away' approach is still subjectively more comfortable, though it does take longer.

there are controls for both speed and temperature, as well as vent direction. it's not difficult to find a comfortable combination.

I understand what you're getting at, but having 1-4 vents pointed at the front of your body is not the same as having the cabin air at a particular temperature. Neither is having air blowing on your front side the same as having air swirling about your entire body.

Basically, any fan/temp setting with vents directed at you either feels too uncomfortable or not cooling enough due to the direct impact. It's easier to fine tune ambient cooling with vents directed away from you. I wonder how these jackets work in that regard.

That is a problem that people can solve if they want to. But if you insist that you need help: I find that aiming fans across extremities, arms/hands and legs, is very pleasant and effective (a higher surface area : volume ratio?).

God this is such an engineer response. Yes every body is the same and everyone should always do the most optimal thing regardless of the actual outcome or goal.

Some people have poor blood circulation. Pointing a small fast fan at their arms will not cool their core.

Some people get dry eyes easily. Pointing a fan at their face will make them extremely uncomfortable.

Some people are extremely sensitive to temperature changes. They don’t want to be hot but pointing a 40 degree F stream of air at their chest will give them physical pain.

No, this isn’t a one size fits all problem/solution. The correct solution is actually to cool the whole car while allowing the user control over how to cool themselves by adjusting the fans/doors. It would be much better however if car manufacturers included better PID controllers as well as moisture sensors inside and outside the cabin to create better climate control. In a car that really shouldn’t be difficult, at least with the windows closed. It’s not like a house with multiple rooms that have different exposure to heating and cooling as well as sunlight.

I didn't say it one solution would suit everyone. I offered a tip.

The problem is solved by letting me point the vent away from my body to cool the ambient temperature of my car.

I don't want to have cold hands, arms, and face, while my back and my feet sweat.

Cooling my extremities seems to cool the rest of me effectively. Cooling the ambient temperature creates another problem, increasing the ambient temperature for the rest of the world; it's a big problem. However, a car is a small space; I expect the climate impact would be relatively small.

Somehow dogs can get away with cooling through their tongue but the naked apes still complain about their whole arms being cooled?

Maybe humans sweat more than dogs and so feel a much greater effect from evaporative cooling?