It's not a perfect analogy, but none of my comments are directed at the use of JS for a game, it's a fine choice. It's the use of Next.js that's the issue, it's a framework for server side rendering of HTML. It serves no benefit if your goal is to make a 3D game, it only adds overhead. If he had not been using it he would have realised there's a few bundlers out there that are far better than what Next.js dev server provided at the time.