I use it on web/AppleTV/FireTV & IMO it doesn't have a great user experience on any platform. Generally it's a bit jerky/laggy & also often gets glitchy (on FireTV at least) post very long running videos. I'm not saying it sucks, but the apps for Disney & Netlix feel so much better to use. My comment wasn't directed at WebAssembly.

I’ve been impressed with the Disney app. They had a rocky start but now it’s excellent. Definitely better than Amazon’s in my experience.

It is painfully slow comparing with its competitors, and for no good reason to be so.

Overall it has the shittiest experience, also thanks to the monstrosity that is X-ray.

At the best, this article can only say Prime Video would be more shitty without WASM maybe?