Depends if they mean “everything” as in every option, or “everything” as in every service.
The latter implies only common needs covered in the GUI.
Edit: the complete source paragraph does go on to list services. Which confirms they’re talking about every service rather than every imaginable operation.
Then click service like "Easy containers" and look at screenshots provided and then there is one having "Expert" tab - they don't provide screenshot of that and I bet there are at least 10 checkboxes.
Most likely if you are an expert you already have one liner ready to configure "Expert" stuff and you don't want to click checkboxes.
You might be right, however you're constructing an argument around an assumption there.
Like yourself, I find the CLI more intuitive than a GUI (so much so, I even wrote my own $SHELL and terminal emulator), but it's difficult to argue for or against their specific approach when the subject is based on speculation.
If you're able to share a screenshot of their "Expert" tab to show how it's not particularly easy to use, then that would go a lot further to demonstrate your point.
The latter implies only common needs covered in the GUI.
Edit: the complete source paragraph does go on to list services. Which confirms they’re talking about every service rather than every imaginable operation.