As you probably know, what you describe has already long been possible without Flash too, just look at FWA. Immersive 3D experiences “in HTML5” are now 10 years

As you probably know, what you describe has already long been possible without Flash too, just look at FWA. Immersive 3D experiences “in HTML5” are now 10 years old on FWA. I know because I was there. The only difference is that they now cost more, but also are not as requested, as mentioned in a comment in this thread: > heavy, high-gloss interactions akin to what Flash afforded and what could be accomplished with WASM/WebGL are not what people want in their mobile browsing experience