I should have read the documentation more closely, but DXF output is the only reason I purchased a vector drawing program like Affinity Designer in the first place. The fact that it doesn't support DXF output makes it useless and I will not be buying it for the rest of my team. Too bad...
I'm sorry to hear about the lack of DXF support, as the only reason I bought Affinity Designer was to create vector layouts for a laser engraver. The workaround is to convert SVG to DXF, which is a pain in the butt for my workflow, but at least I don't have to deal with Illustrator. If you're counting requests, here's another one for DXF export!