I find myself having to spend too much time filling out export options. Here's a scenario that is likely familiar: you need to develop a number of images and they all need to end up as, say, 95% quality sRGB jpegs with a maximum width of 2500px. I'd like to either be able to choose a preset directly from the File > Export menu item or (and) have a command "Export again" that uses the previous export settings for the new image. Right now, one can't specify maximum width (etc.) in the export presets, so that's an additional problem.
Incidentally, I find that setting export parameters causes Affinity Photo to use up all of my CPU, and this slows down the appearance of pull down menus and suchlike. I am not used to this, working on a late 2015 iMac with impressive specs (3.3 GHz Intel Core i5, 24 GB 1867 MHz DDR3, AMD Radeon R9 M395 2048 MB, 2TB Fusion drive).