Utter balls. As you said, "...4WD improves traction..." - and acceleration is limited both by available traction and power. Without sufficient traction, power is wasted. And every tire has a traction limit.
And differentials have efficiency loses. The extra traction is effective on a loose surface, and on corners. It has next to no benefit on a dry road in a straight line.
Transmissions also have efficiency losses, but the gearing provides benefits that outweigh the losses. The small loss due to using a differential is more that offset by essentially doubling the grip available to soak up the power. And the extra traction is a benefit in any situation where your available power exceeds tire grip - that is any situation where you are spinning your tires. And, of course, some cars - Tesla 'D's, for example - do not use a front/rear diff.
WTF makes you think that adding power to more wheels doesn't help?
The fact that every top drag car is 2WD. But you could be right and they've all got it wrong...
Damn, I was betting that was coming! But top fuelers also use rather primitive 500 ci V-8s with actual push-rods instead of overhead cams. Fact is, they are built to a formula which limits them to such engines, as well as to rear wheel drive only. They aren't going for absolute records (I think rocket sleds do that), they are going head to head within a racing spec. And they are so damn fast on two wheels that they had to shrink the quarter mile to 1,000 feet. And they have really big, fat tires that can deliver huge amounts of grip.
Remember, 4WD becomes a benefit only if your power exceeds your 2WD grip. As was the case with every classic 'muscle' car.
And BTW - the top fuelers are also willing to give up a bit of power if it results in a net benefit. The superchargers suck up more power than the normally aspirated engine can deliver. . .