While I'm just getting to grips with Affinity, and this may already exist, the biggest stumbling block I've hit is not being able to select the white or black levels from the image itself as you can in Photoshop - as in, being able to hit that furtherest white option, and then flicking on the part of the image you want to be 'pure' white. Not being able to instantly select the background as white when what I'm mostly doing is making the background of an image white for product photography is really jarring.
It's not enough to turn me away from the product, entirely because I can't afford any Adobe products, but it's definitely turned me away from using Affinity Photo for any photo I have with a white background at the moment. I would definitely rather see the final product with that level of precision in the levels adjustment layer than without it.
