One clear use case where MCP is better than anything else: design system documentation for an enterprise, or using a specific UI library. Daisy UI has an example: https://github.com/birdseyevue/daisyui-mcp

Context7 is a good MCP. If one were to point an agent to a docs website, the amount of tokens consumed would use up too much of the context window to be able to do a meaningfully complex task with it.

Figma MCP translates Figma to a language an agent understands.

Not everything can be a cli.