Like many have already said, your probably just looking for a terminal multiplexer. Things like screen or zellij, which to my knowledge also don’t require any kind of “server”. You start a process and the tool provides means to reattach to the still running sessions.

Any session gets a name, which is what you can use to reattach to a specific one, or you can just “attach” if there isb only one available.

Usually shorter. The better is the first thing to wear out, even if it’s not used much. But it often can be replaced, even if the manufacturer doesn’t officially support replacement.

Ignoring that, they are still built more compact, which makes some components more prone to failure (in particular cooling). But they can still last a decade+ if taken care of and/or repaired.