Growing companies are like growing artists, they have their clients/audience and sometimes they find each other and keep growing.
Beelink sold the U55, U57, GT-R models with Manjaro preinstalled and Minisforum just released this model https://store.minisforum.com/products/deskmini-um700-manjaro-linux
Maybe you read (or maybe not) the announcement:
Tuxedo Computers and Starlabs are continuing to work with Manjaro and sell really great machines with Manjaro preinstalled, at very good price and great configuration.
And did you heard rumors from ASUS that they are willing to support Linux? Maybe they can persuade NVidia to be more friendly regarding the linux drivers for their GPUs too?
An artist friend of mine wanted to marry Claire Danes, it didn’t happen … 
Ahm … I think most linux users came to linux from Microsoft and Apple ghettos and actually got amused by that challenge that had nothing to do with hardware vendors partnership.
Knocking on doors can be done by anyone, for whatever genuine reason. Some developers put their eyes on whatever hardware, bought it and start coding whatever support was needed for linux.
As for the models you mentioned, the desktop might just work with whatever linux distribution, while the laptop might lack some features and most likely, in time, will get added to a wiki as this one Laptop/ASUS - ArchWiki