Because text rendering is (very) hard, and most 3D rendering people are not text rendering experts, but just want to get some text on screen even if it looks ug

Because text rendering is (very) hard, and most 3D rendering people are not text rendering experts, but just want to get some text on screen even if it looks ugly. Unfortunately the browser lacks a proper layered API design with low level APIs at the bottom (like WebGL and WebGPU), medium level APIs in the middle (like text rendering and layout), and high level APIs at the top (like the DOM and CSS) - so if you want to render text in WebGL or WebGPU, you are entirely on your own.