[vbezhenar]

Why local echo is useful?

If I'm expecting echo, it does not add anything useful to my experience. I'm not waiting for every typed character to appear on my screen before I type next one.

If I'm expecting data from the server (say I'm searching through shell history), it might even make my experience worse because of flickering between local and then remote state.

I'm regularly working with 100-200 ms latency servers where latency is noticeable. Improving my perceptual latency was never something I want.

Better approach is to use client/server software. Like vscode. Of course it's out of capabilities of terminal emulator and rather requires full rethinking of the entire shell architecture. But at least it would be meaningful improvement. Like I'm typing first character in shell history search, server transfers all 100 matched lines to the client and now my client can further filter this list without any server hops.