[modeless]

But you can't add or remove people in a call. You have to call everyone simultaneously up front. If you didn't add someone at the start, you have to hang up and start a new call, and hope that everyone else hangs up too so they can join the new call.

Duo has a ton of problems around establishing calls, and identity in general especially with multiple devices. It also has kind of a mystery meat UI with unlabeled buttons and undiscoverable interactions. And the artificial separation between text and video chat (Allo/Duo) never made sense in the first place, and continues to hamstring Duo even after Allo's death.