My T14 has even a dedicated slot for a SIM card.
At least with Lenovo laptops, that is very common. You con't need to order the laptop with a radio; it can be easily upgraded.
(Note: My estimate on this is purely based on Apple implementing/expanding the use of their own cell modems, which also includes their wifi chip. It seems logical that they would quickly adopt the same chip for wifi in their laptops, thusly getting LTE/5g 'for free'. Definitely no insider knowledge on this)
https://www.macrumors.com/2011/08/14/photos-of-a-prototype-m...
I think it was a year or two latter I got a Chuwi Lapbook 12.3, which was a great machine. Lovely 3:2 screen off the Surface Pro, again a pretty good Intel small-core set-up, decent ram, ok SSD, all so cheap. Great metal case. Lovely machine, at such a great price. https://www.notebookcheck.net/Chuwi-LapBook-12-3-Celeron-2K-...
I’d love to see someone retrofit a modern soc into the vaio p motherboard form factor. There were a few partial efforts on GitHub but seems like Sony’s miniaturisation skills remain undefeated.