The ceiling of what mcp-ui enables is super high since it can really be anything but that makes it hard to imagine.
To me, considering the floor of what mcp-ui offers is much more compelling. It lets us plug a gap where Google search beats LLM chat - the little functional UI widgets like timers and conversions. This repo is a proof-by-example to show that mcp-ui can be useful.
It should be easy to fork and build your own custom widgets too!