It's likely limitations of the drivers for the underlying hardware they were able to source in quantity and at the right price. Some of the highest-volume manufacturers have traditionally also been bad about Linux drivers (looking at you, Broadcom).

Brand new hardware rarely has perfect Linux support (or the other way around).

My experience is that it takes about two years to get 90% or better hardware support on a new one.

They say they made significant improvements to Linux support with this 12th gen model. Here's hoping!