Chill olf, Chen isn't an idiot and knows the costs of developing a custom PCB.

You also seem to be misunderstanding exactly how the device adaptation process goes, generally speaking the OEM will give you an android aosp/caf adaptation which wouldn't be so bad building LineageOS from.

Also on the Sailfish OS porting side, the problem is the design of android doesn't have an 'android-kernel' and instead tends uses userspace driver blobs. As before I warned against being too similar to the Xperia X due to poor kernel support for some of its devices, particularly the Wifi+Bluetooth+FM chip. So no, just because something is well supported by Lineage OS doesn't mean all the pieces are there at all.