hehe - don't tell my employer! The more specific reason I ended up in the browser because the Unity WebGL exporter thing was too broken for too long
On a more serious note - Unity has published some demos with it and it looks really cool. They are an amazing company and my guess is that they will be able to convert their VM runtime into WebAssembly at some point, and there will be lots of amazing content built in it.
Though it will have a serious overhead imho, at least for a while, and those that can DIY will get better mileage. I'd suspect that WebAssembly will also have an impact on other more direct WebGL Api's like Three.js
Personally I've always avoided learning Shaders and WebGL... it terrified me (esp since I don't have strong math skills. I don't know matrix multiplication yet nor how to convert coordinate spaces, etc.)
However, I recently bought a book on 3D math and on WebGL... hoping to learn it going forward so I can be more self-reliant and not need to wait for Unity to fix their exporter and things. Right after I get better at this functional stuff