When I travel, I like carrying as little as possible. These comments are fascinating to me, people are brining more devices than I have in my whole house and needing to make a LAN for them. Personally I just connect my phone to WiFi and then use Tailscale and call it a day.
Some people spend 100+ days a year in hotels.
The multi-uplink is intriguing. While on the surface it seems that an ostensibly 'plug and play' carrier aggregation dongle (no idea if this is actually a feature) would be a easy solution to smooth out poor connections, many networking hiccups encountered during travel just boil down to impossibly terrible RF environments, regardless of the spectrum or protocol.