We don't need SDKs, they publish API docs.

We don't need packages or functions, we can just write the code ourselves, every time it's needed.

We don't need compilers, the computer understands assembly already.

It's a mismatch of use - MCP isn't about telling the LLM about the APIs. It's also about encapsulating and simplifying them so the LLM isn't manually figuring them out every single time from scratch.