Content aware scaling is actually a really great feature. The examples in the first post are extreme, but it is actually great for doing subtle stretches on a wide range of images to make them fit different aspect ratios. I also use content aware scaling to extend paintings or textures all the time.
I've just recently started playing with Affinity Photo in the hopes of ditching photoshop completely, and this feature really is one of the only must-haves that is missing for me. Please consider implementing this! It really is an impressive and useful tool.
I'm loving Affinity Photo so far, great job and thank you very much!