There's always a speed/storage tradeoff. Apps should be more economic too, but you download native apps once, and web apps almost every time you open them. So i

There's always a speed/storage tradeoff. Apps should be more economic too, but you download native apps once, and web apps almost every time you open them. So indeed, caching could help, but how large would your cache have to be? Big enough to hold all 50MB downloads for every website you visit? That's an awfully large cache. So I'd say economy is more necessary for web-apps than for native/store apps. I just checked my web usage on my work computer. The last 120k opened URLs were on 8300 unique hosts. 8300 * 50MB is not feasible.