Musk is espousing a UX fallacy by saying that a more "natural" interface is superior. Natural interfaces have a shallower learning curve for beginners, but CAD designers are all going to be expertly trained in their software. This is why pros always know the hot keys even when the mouse is simpler. Hot keys are faster. Learning how to pan, tilt and zoom with a mouse and keyboard is an 1 hour lesson that they will apply for 20 years and never worry about again.