Affinity software is great and while developers don't plan to make Linux version soon, maybe they could consider some engine changes, to open it for Wine in Linux. Yesterday I was looking for some alternatives for Sketchup. It is one of my favorite Windows programs without Linux native version. I've decided to try Sketchup Make 2017 with Wine because I didn't found any descent alternative. It runs great, and I must admit, I had great relief, to have one of my favorite programs runnig on Linux.
I will be waiting for the same relief at Affinity programs. Best option would be Linux native version which would use all Linux advantages, but ability to run it with Wine would also be great option. For now, Windows partition stays on my disk, just because Affinity software. [...and my daughter's Roblox, which also doesn't have alternative]