Correct me if I'm wrong, but an MCP server still make a lot of sense for remote-controlling a UI application (like a game engine editor) which otherwise doesn't have any 'access points' for remote-control right?

An AmigaOS-style "scripting port" would work just as well, but AFAIK that's essentially what an MCP server is (a socket that implements a discoverable command protocol).

I would actually love if all applications and services could agree on a standard for scripting / remote-control. If the AI hype is what it takes to get there, then so be it ;)