Dell laptops can be configured with LTE modems.

There is no reason macOS cannot have some option for throttling usage by background updates when connected over LTE. iPads have an LTE option.

That carriers have not figured out how to charge me by the byte over all my devices instead of per device is really not a big issue to me. I would like to pay for an LTE modem and the necessary bandwidth.

My intuition is that when Apple has their own LTE modem and is not dependent on Qualcomm, a MacBook Pro will have an option similar to that for Dell power users.