Bandwidth is not the problem when you are using mobile connections (4G, weaker 5G). Videos work just fine, but ssh can be painful already without keystroke obfuscation. The problem is latency. Especially when roaming abroad it can 100s of ms.
Not sure whether the obfuscation is fully synchronous, i.e waiting for the server response before continuing. That would really kill it. Working with LTS distros I don't think I have seen it in practice yet. Need to try something modern on my next trip abroad.
> Not sure whether the obfuscation is fully synchronous, i.e waiting for the server response before continuing.
The people who designed SSH aren't idiots, and also, you can answer this question by simple observation: When you connect to a server with ~200ms ping, which is somewhat common in the scenarios you describe and which I've done many times, it does not take 20 seconds to show a keystroke.