Very true, I'd personally never use the tab completion since the secrets are short enough, and I will probably raise an issue on the project to have that be optional.

And for the rest, they're still a hassle compared to just having your hackerspace friend install magic-wormhole so you can toy around with the nonsense he has on his Raspberry Pi.

Your last point, however, I think will be the key to the future (no pun intended). I'm hoping asymmetric crypto based communication will become easy, ubiquitous, and the default. Cheers to Keybase!