Starting game development in JavaScript with no experience

This isn't necessarily the case if you are looking at total cost of ownership.

3D provides things like perspective projection, which enables intuitive experiences and notions of "world space" that are fundamentally meaningful and map well with our physical reality. You can do a lot of damage with 3d primitives, an FPS camera, a skybox and some clever lighting.

If your goal is to make a game, these are exactly the things you should be learning, not reinventing your own architecture. If you just want to learn about engine internals, then sure go for it. But games (even very simple ones) are an incredible amount of effort that has nothing to do with programming. If you actually want to make one you should be working at the absolute highest level of abstraction possible so that you can start doing the real work; building the mechanics, creating the art, designing levels, writing the story, music, sound effects, etc. etc. Many of the succesful indie games these days are made almost completely via "no-code" visual tooling. It's basically a meme at this point for programmers to want to make a game and just end up wasting their time writing a naive engine.