fastmcp CLI with stdio use case?

[ngaloppo]

When I start a server with fastmcp run server.py:mcp it starts an instance of the MCP server with stdio transport by default. What's the use case for this? If I write a client with client = fastmcp.Client("server.py") it will automatically start a new instance of the server, instead of using the server that's running in the first process. I don't understand why I would ever use the fastmcp cli to start a stdio transport server. Is it to connect from clients that do not use the fastmcp ecosystem of tools?