I do have one: Atlassian now allows connecting their MCP server (Jira et al) for personal use with a simple OAuth redirect, where before you needed to request API keys via your org, which is something no admin would approve unless you were working specifically on internal tooling/integrations.

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.