When you say "why change it" are you not aware that many US states vote by mail (and/or ballot drop boxes) and have for decades? Or are you ignoring it?
Standing inline with your neighbors to exercise our vote is empowering. It reminds us of our status as voters. As equals. It crosses boundaries. It's beautiful.
Sure there's cases where appearing in person isn't practical and I'm not suggesting we close the door to that. But I think it should be needs based.