Short answer, because a flex hose whip on an AP Nano or mini air die grinder fit in places an 18V battery impact or grinder doesn't, and there's no 18V Aircat 1150. And air tools don't overheat (their cutting tools might, but the motors don't).
Sure cordless has made inroads on air, and will continue to do so. I use them too. But they're not obsolete, and even when they are, they will still work, unlike an obsolete cordless tools with bad dead discontinued batteries, and burnt out electric motors.
Sure cordless has made inroads on air, and will continue to do so. I use them too. But they're not obsolete, and even when they are, they will still work, unlike an obsolete cordless tools with bad dead discontinued batteries, and burnt out electric motors.