You won’t be able to automate common tasks, or use the full power of the tools available to you. And you won’t be able to combine your tools to create customized macro tools. A benefit of GUIs is WYSIWYG—what you see is what you get. The disadvantage is WYSIAYG—what you see is all you get.
Failure of our primitives and toolkits. Theres also a point about wysiwyg and its relation to algebraic reasoning. The visual representation and discoverability need to be divorced from automation or composability.