Just compared PNG resizing (Affinity: Bicubic) to full Affinity vector file:
The stop button is the PNG (10 seconds work), the pause button is the AD file (10 minutes work). You can see that the pause button edges are sharper—stop looking softer—but there's not much in it.
I think I may be use standard PNG resizing as it would save hours upon hours of work, and I doubt anyone would notice the difference without looking very critically.
Thoughts?