In my opinion if we're going to have a stable and a consistent API, I'm totally ok if it's going to be significantly harder. I think we should not need a middle-tier library for creating 3d graphics. Most of the time We needed threejs or twgl for mapping the shader inputs (uniforms etc) with javascript. The rest of it is just pure matrix math, that we do in 2d graphics as well.

It's worth to mention that they're also going to create another shading language. https://www.w3.org/TR/WGSL/