GTM ClubA sixty-second video with the prospect's website on screen says "a human spent time on you" in a way no text can. Reply rates on well-made ones are several times cold email; the cost is that each one takes minutes, not seconds.
It belongs on the accounts that deserve minutes: the ABM list, the deals stuck after a good first call, the champion who went quiet. Sent at volume it becomes the thing it was meant to replace.