As someone pointed out on the comment, one of the reason is Money, the other one is safety and security based on Vehicle manufacturer claim.

Yet, nobody can stop you to sniff and monitor your own car CAN/OBD2 interface using as simple as cheap microcontroller and compatible OBD2 interface kit (e.g CAN Transceiver/Controller kit).

EDIT: So far this curated list helpful to me for CAN bus based protocol.

As long as the bare necessities is available e.g 14" with HDMI, 2 Type C with PD and DP Alt, MicroSD/SD card reader, smart card reader(?), 2 USB A 3.1, 1x 3.5mm jack, 1x ethernet port, kensington and easy maintenance, for me it’s enough. VGA connectors (dang those older projectors) can be handled with VGA to HDMI adapter.

My daily device is T14 G1 AMD with dualbooting separate SSD (M.2 WWAN slot used as SSD).

Woah, thanks for dropping the link. I did disable w10 update by modifying registry for each services which time consuming.