Does that also cause a sound?
I realize it might not be a common thing in all cultures, but in some it’s a social gesture with a lot of utility, like signaling “hello”, “good-bye”, or just acknowledging somebody’s vEveresting effort, even if they’re taking their time.
I do agree that an elbow flick is much too subtle for the general Zwift demography. That one should really be replaced with a flare gun. 