The "MiFi" is one more thing you need to keep charged and have to put up with shitty firmware.
Region locking isn't a big concern - as far as I know no iPhones are region-locked (the appropriate one might perform better in certain areas, but nobody is outright locking you out?), and Macbooks are already region-specific anyway based on keyboard layouts.
You do not have to agree, you have to experience it firsthand. I travel on a frequent basis and still run into occasional problems. 6GHz frequency bands on 5G are still not supported outside the US, for example.
Granted, 5G is the best we have had so far, 4G was worse, and 3G was even worse. 2G effectively did not exist outside Europe and most Asia, for the US had incompatible TDMA and CDMA networks and only got 2G on a largely unsupported 1.9GHz frequency with exactly one mobile operator, which only the Motorola and a few other handsets could use. To travel to South Korea, one had to acquire a CDMA handset, for the country did not have 2G GSM networks.
I am not claiming that MiFi is a perfect solution. It is a solid compromise, though. I am also aware of the firmware problems (my current 5G MiFi device does not even properly support WPA3), but I can live with that for now and will replace the device at a smaller cost compared to a laptop replacement cost. I am okay with that.
The "MiFi" is one more thing you need to keep charged and have to put up with shitty firmware.
Region locking isn't a big concern - as far as I know no iPhones are region-locked (the appropriate one might perform better in certain areas, but nobody is outright locking you out?), and Macbooks are already region-specific anyway based on keyboard layouts.