That and the abomination of the technology stack that we use for said process. HTML/CSS/JS is absolutely not the answer for "I want to make a UI", never mind th

That and the abomination of the technology stack that we use for said process. HTML/CSS/JS is absolutely not the answer for "I want to make a UI", never mind the fact that many UI designers have no clue how the stack works and abuse it horribly. The idea may be "paper", but what's actually being done is far from it. The browser may paint and repaint a pixel a dozen times before it's ever rendered. DOM-traversal is one of the most important parts of a browser's optimization because of the tens of thousands of times it can happen to paint a screen.