While its stated in the tech specs, it might still be surprising for current MacBook users. The M1 was loudly marketed as strictly superior to previous CPU/GPUs so regression in I/O and screen support might be easily missed.
The MacBook Air, the Mac mini, and the baby Pro are the M1 options right now, so people are trying to bodge them into being something they aren't.
I've heard a lot of stories of people who bought them not expecting to replace a 15" MBP or even iMac with a MacBook Air. Then once the bits hit their shiny new CPU they went whole hog.