I really like the app(s) at first glance. I wished for years to have an adobe alernative. Being a professional Photoshop user I gained really deep skills and there is hardly a shortcut I don't know. IMHO: I'm among many Photoshop Pros - If you want to win us it would be a very good idea to have the same shortcuts as far as it goes.
Tasks like:
option+backspace and cmd+backspace for filling an element/selection with forgroudn/background-colour
cmd+click on a layer o select it
cmd+click onto new layer icon to make a new layer underneath the active one
option+draw to draw from center (instead of cmd as in affinity products)
...
are not only convenient - they're the real MVP, they're lifesavers, holidaymakers
Please consider approaching them (also in Affinity designer vs. Illustrator) - you might want to consider a preference-setting: "use Photoshop shortcuts and keystrokes".
I am sure you are going to gain much more people that way.