The major advantage of CLI is IMHO that you can use a CLI yourself too. It's a universal tool.

One thing I hate is when people write an MCP server for something useful and just that. Like, why don't you tell the same Claude or Codex instance you wrote to also expose the same functionalities as a CLI? The problem is that it's full of technical people with zero CLI knowledge nowadays (or, rather, for the last 20 years or so), and it kinda sucks in general, because lots of stuff only comes in GUIs that are not composable, not scriptable and sure as heck full of stupid bugs and limitations due to how harder it is to get GUIs right compared to popping out a "dowhateverctl" kind of tool