This is also my point of confusion. People in the comments seem to be saying that MCP is necessary due to discoverability, but I fundamentally fail to understan

This is also my point of confusion. People in the comments seem to be saying that MCP is necessary due to discoverability, but I fundamentally fail to understand how a protocol can make interfaces discoverable to an LLM in a way that wouldn't also be achieved by making traditional interfaces more discoverable to a human. These things mimic human behaviour after all. Surely people aren't saying we haven't solved API discoverability by now and need new tech for it.