Earlier quoted context omitted.
Give me a MB with LTE and I can finally stop buying®retting iPads. Maybe Apple moving into the modem space will get us there but it does feel like some sort of purposeful market segmentation
Just tether to your phone
Hotspot/tethered data is a separate pool from general mobile data. Once you've consumed the guaranteed "high" speeds (60GB on AT&T's current Unlimited Premium Plan), all hotspot speeds are then hard capped at 128Kbps. AFAIK you can't even purchase additional data at these speeds if you wanted to. Mobile data on an iPhone or iPad won't have that hard cap. Although in the past, once the guaranteed 5G speeds were consumed, your mobile data speed was simply deprioritized but could still achieve 5G speeds based on current network conditions/congestion.
There are scenarios where a notebook would need this much data and speed and there are Windows notebooks available for this purpose. The "just tether your phone" cohort either hasn't considered this or simply dismisses it because they may have not experienced this limitation personally. I suppose that Apple doesn't see the demand for a macbook with a mobile modem or otherwise doesn't see the need to make this option available.