I dont know why anyone would buy this unless the pen drawing experience is a lot better than on the Surface Pro and Ipad Pro and you're primarily an artist.
The Surface Pro has a real OS with Windows on it, I'm sure somebody will hack the Pixelbook to allow Linux but it will probably have a bunch of stuff removed and unsupported then.
It makes zero sense to buy this locked down device for 1k as far as I'm concerned.