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Wi-Fi Goes Long Range on New WiLo Standard
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
Laptops with Ethernet are still pretty common. I just bought one recently. At work, we buy a lot of them. But I don't think smartphones ever had integrated wired networking.
But that aside, what you're describing is already happening. Wireless network deployments are much, much cheaper than running wire to each building. In semi-rural areas, WiSPs are pretty common. And 5G for home Internet access is pretty common in high-coverage areas. And as time goes on, the ISP-provided equipment is more locked down.
But I don't think those things are related.
Not in the US, but every LTE home internet provider I've dealt with is just a SIM that you can use in any off the shelf LTE/5G to wifi router setup. Mikrotik options are cheap and can handle simple one-device implementations, and multi-device mesh setups (that require more effort to configure)