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By I could, I meant that my phone has a persistent connection uninterruptedly long enough to be theoretically able to serve a website in the background. There are all sorts of (arbitrary, mind you) technical limitations, from the IPv6 address randomly changing as you roam across networks to iOS killing background processes - but those are software limitations.

The point was that mobile device doesn't equate spotty connectivity anymore for most people.

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Even in this idea of "could in principle", the IP address randomly changing as you roam is not an arbitrary technical limitation, it is a fundamental property of how IP networks operate that proved to be too hard to fix for IPv6. The LTE network does a lot of work to try to preserve your IP as seen by the servers you connect to, to preserve your active connections, but this could only be done as a layer on top of IP.

The reason why this is fundamentally quite hard is to do with routing optimization. Routing tables have to reflect physical connectivity - which means packets destined for F2::67 mustn't be routed to LA if that is the IP of a phone that is now resident in SF. However, changing routing tables on all devices along the way as a phone roams would not be an easy feat.

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