You're absolutely correct - the intention of this certainly isn't to somehow simplify the process of building neural nets, which, if you're just running things locally at least, is fairly straightforward. The intention of the drag and drop interface is to give a clear and consistent way to visualize your neural net architecture. It also lends itself to a nice way to display per layer outputs.
But EM as a subject, as its usually taught, is still theoretical. Experimental EM would be better known as either electronics or statistics. You make it sound like theoretical means lacking experimental support, perhaps that is what the word means in, say, politics, but certainly not in physics.
OR you can simply project the fourth dimension into 2D, much like how we project 3D pictures onto 2D screens. Here's an example http://jakebian.github.io/hypercanvas.js/