In ten years time YouTube will be entirely inaccessible from the browser as the iPad kids generation are used to doomscrolling the tablet app and Google feels confident enough to cut off the aging demographic.
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The biggest hack to this is React Native, which barged just in due to sheer Javascript and web dominance elsewhere, and even that has a ton of problems. Plus I'm fairly sure that the React Native JS only runs in the JIT approved by the Apple Gods, anyway.
Otherwise, we're stuck in the old days of compiled languages: C/C++ (they can't really get rid of these due to games, and they have tried... Apple generally hates/tolerates games but money is money). Rust works decently from what I hear. Microsoft bought Mono/Xamarin and that also sort of works.
But basically nothing else is at the level of quality and polish - especially in terms of deployment - as desktops, if you want to build an app in say, Python. Or Java. Or Ruby. Or whatever other language in which people write desktop apps.
And we're at a point where mobile computing power is probably 20x that of desktops available in 2007. The only factor that is holding us back is battery life, and that's only because phone manufacturers manufacture demand by pushing for ever slimmer phones. Plus we have tons of very promising battery techs very close to increasing battery capacities by 20-50%.
Silicon Carbon batteries. And others, but this tech is already in production.