Yeah good point. Username would be a must.
I'm not in discord to know details I just view their videos.
I'm curious too now then of how they implemented it.
I also agree that multiple sign ups is a turn off.

Long ago, Hive (as steemit) wanted to implement itself as a 'master sign in' that could be used across other platforms (the way hivesigner works) so the onboarding/user capture needs to be improved still. KEYS are obviously important but they confuse regular folk.