[idlephysicist]

I'd agree with you. The readme calls out "Significantly faster session establishment" and goes into greater detail later on.

> Establishing a new session with SSHv2 can take 5 to 7 network round-trip times, which can easily be noticed by the user. SSH3 only needs 3 round-trip times. The keystroke latency in a running session is unchanged.

I, for one, can say that sometimes session establishment can take a little while but not to the extent that it would be a selling point (so to speak) for me to adopt SSH3.

[markhahn]

ssh is fairly often used non-interactively.

so if you want to execute uptime on a remote machine, the session will only be open for a few ms, and those extra RTT are a problem. (Yes, I know about openssh controlmaster...)