My brush strokes & brushes in Affinity Designer/Photo always have ragged/pixelated/AA-artifacts no matter the resolution of the document.
I have made sure I am using the Brush tool and not the pixel brush tool. The same problem consists whether I toggle Windows Ink on/off in either the Wacom settings or Photo/Designer settings.
RTX-2080Ti / Wacom Intuous PTH Tablest / Windows 10