There is a big difference, IMHO, between an "explainer" and "documentation".

For an article explaining a concept, it's a balance to find, and it depends on the target public. If every physics publication started by teaching physics to the reader, it just wouldn't work, would it?

Regarding documentation: we probably all agree that a code repository should NOT explain how programming works: if you don't understand C++, then a C++ codebase is not for you.

But should the README explain how to, e.g. run CMake? I would agree it shouldn't. Just like it shouldn't explain how to clone the git repository, or start the computer.

This said, I find this particular explainer about MCP... convoluted.