I would love to see an option when saving JPG, PNG and GIF files to losslessly compress them and remove unnecessary junk in order to achieve minimal file size :) ...
Something like ImageOptim does (with tools like PNGCrush, MozJPEG, Zopfli, AdvPNG, Jpegoptim, Gifsicle, SVGO and PNGOUT).
And bonus: Images that are used as Resources in Affinity Photo and Designer can be losslessly minified as well (in affinity photo there was saving 10MB from 51MB = 20% on my test run)