[lucideer]

The former is discoverable: it doesn't require developers having ANY knowledge of command switches (no matter how basic) nor following a set of out-of-band instructions; the "how to" is included within the workflow.

[sokoloff]

ssh-add (once per session) gives users back that incredible convenience. If you wanted to rotate certs, you’d have to add each new one, of course.

[the8472]

The server could display that info when a user tries to log in via interactive authentication.