Earlier quoted context omitted.
Given Apple have gone cellular with everything all the way down to the Watch, I’m always amazed they never included it in a Macbook.
They expect you to have an iPhone; using that for cellular data is literally one click away.
In my experience, personal hotspot on my Macbook takes about 30 seconds to connect, and it sometimes just fails to connect altogether. It disconnects when I close my Macbook, so next time I open it I need to connect again. Sometimes my phone doesn't show up in the Wifi menu and I need to manually start hotspot mode on my iPhone.
I'd much prefer a built-in cellular modem.