Another way to phrase it is that MCP normalizes individual users having access to APIs via their clients, vs the usual act of connecting two backend apps where the BE owns a service key.
At work I built an LLM-based system that invoke tools. We started before MCP existed, and just used APIs (and continue to do so).
Its engineering value is nil, it only has marketing value (at best).
Anthropic wants to define another standard now btw https://www.anthropic.com/engineering/desktop-extensions
MCP is for technical users.
(Maybe read the link you sent, it has nothing to do with defining a new standard)
Isn't that what we had about 20 years ago (web 2.0) until they locked it all up (the APIs and feeds) again? ref: this video posted 18 years ago: https://www.youtube.com/watch?v=6gmP4nk0EOE
(Rewatching it in 2025, the part about "teaching the Machine" has a different connotation now.)
Maybe it's that the protocol is more universal than before, and they're opening things up more due to the current trends (AI/LLM vs web 2.0 i.e. creating site mashups for users)? If it follows the same trend then after a while it will become enshittified as well.