I switched from MacOS (=bad politics...) finally to Linux now;
but still need to run Window$ on a VM for my beloved graphic tools.
Each time I start have to run Windows on to work with Affinity Photo or Adobe Lightroom it is a pain!
I think the same as AffinityUser42 - if someone decide to switch to another OS, he would compare the availability of tools.
And badly the best graphic tools are not available for Linux now - this holds a lot of these people in the spider world of Microsoft and Apple.
I'm sure you guys are able to do a commercial Linux version of Affinity Photo - you only have to support at least Ubuntu - should be fine for the most.