I disagree that "Most OEMs don't officially support Linux". Lenovo supports Linux on 17 laptops released in 2022 alone [1]. Dell also has a similar effort, with Linux supported on the 2022 XPS 13 Plus [2] among others. HP has its DevOne[3]

But at the moment, I don't know of an modern, high performance ARM laptop with official Linux support.

The closest thing I know of is the Nvidia Jetson AGX Orin Dev kit by NVIDIA[4].

[1] https://support.lenovo.com/us/en/solutions/pd031426-linux-fo... [2] https://ubuntu.com/certified/laptops?q=&limit=20&release=22.... [3] https://hpdevone.com/ [4] https://www.nvidia.com/en-us/autonomous-machines/embedded-sy...