I think that Affinity photo/designer are both great products, although there's many instances where the interaction is far from optimal. I don't use the product so often but every time that I try to do something, it either takes me a long time to get familiar with the tools, or I just can't get what I want easily. The last examples:
1) if I select a vectorial element I can see the "curve" section in the main toolbar (top left), and edit the stroke properties. If I select two vectorial elements instead of just one, that toolbar disappears. Why is that? How do I edit stroke properties globally then? Please don't tell me that I have to edit them one by one...
2) how do I copy the #value of the colour of the selected element, so I can apply it to another one?
3) why can't I define a #value for the stroke colour? I can only edit that in the right hand panel, but that seems to apply to fill even when I select a line that has no fill.
4) if I multiple select objects and then move arrows keys to move them, they jump to a new location that has nothing to do with the initial position, and then start moving as expected (but from the new location, not the location where they were when they were selected).
5) why can I hold shift to resize a rectangular shape maintaining the aspect ratio, but I cannot do the same with an image? Cmd seems to work instead, but it does not resize from the corner being dragged, and the whole thing is very cumbersome.
6) why is it so difficult to crop an image, or copy and paste a portion of it?
I understand that some of these issues might disappear once you get familiar with the tool, but also believe that it should be easier to make changes in the first place. A good UI doesn't need any explanation or long series of trial and error.