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Indeed. Power management alone is a massive research area with never-ending complexity across a bunch of domains. And nailing the ecosystem correctly is very hard (both devices and software). Security is another bottomless pit of research and improvement. When trillion-dollar companies like Amazon and Microsoft ceded mobile to Google and Apple, it was a good demonstration of how hard a successful mobile platform is to get off the ground.

Nah that's complete bull. It's been a solved problem since Android 2.0.

The only thing they're improving on mobile these days are addictiveness and data collection.

There are experimental mobile platforms, and they work fine. They won't appeal to the mass-market but there's really no reason to disallow them.

UI/UX is not the problem at all, app compatibility/availability is.