It is the automatic distribution and automatic update. The questions isn't "how does one download a text file to another persons computer?". It is "how does someone with a skill.md file on their computer discover that a new version of that file is available".

This isn't a "bottleneck" but rather a capability (or lack thereof). As you add more and more capabilities, especially ones relevant to enterprise situations like authentication, authorization, governance, etc. then MCP starts to pay off.

If you do not need those capabilities, then you do not need MCP. And then you shouldn't use it. But if you do need those capabilities then it might be worth using MCP rather than inventing your own way to do them.