Ironically, when I have the laptop on my lap, there is enough clearance between my legs to let air through. If I put the laptop on a mattress, it gets ridiculously hot because it doesn't activate lap mode and the mattress makes a great seal on all of the chassis bottom edges.

It's also a mismanagement of resources that someone is writing IMU drivers and some [clearly imperfect] decision logic, some other person is routing that IC onto the motherboard, the thing will need to be documented and bugfixed (and not necessarily by the same people that designed and wrote the thing), it adds another supply chain constraint, the whole subsystem is an unnecessary power consumption (even if it's optimized to 50 or 20 uA)...

There are much bigger fires to extinguish at Lenovo with their hardware/firmware/vendor/driver choices, and a handful of people are spending finite engineering resources on "lap mode."