Not a bad idea for some circumstances. For mountain bikes, probably pointless... but not all bikes are the same.
I'm not going to fret about adding a few grams to my cargo bike wheel, because that bike — which has fat tires on 20" rims and steers by a control bar — can get a real nasty, violent speed wobble. It's slammed itself from side to side hard enough to lose directional control and rip through the seals, spraying oil all over the place in the process, plus the fork was permanently deformed and had to be replaced. Anything that helps mitigate this problem is worth trying.
Having also previously experienced speed wobble during a fast descent on a road bike, I'll be doing my road wheels too; seems well worth the few minutes of effort.