(Or he’d get Lucius or Alfred to do it, but that’d ruin my metaphor.) He’d streamline his animation workflow with expressions.
So if you sat him down in front of After Effects, you wouldn’t see him brute-forcing a bunch of keyframes around. Instead, he shows up with a kryptonite spear. And he knows better than to fistfight Superman. Whichever flavor of Caped Crusader you prefer, it’s fair to say he’s best known for the nifty gadgets he calls upon to get the job done. (He’d also have a special UI brightness setting labeled Really Dark, but that’s a different topic.) If Batman used After Effects, he’d definitely use expressions.