well yeah, the tradeoff you accept when you decide to use a procedural technique rather than taking the time to make something by hand is that you don't get to control everything by hand. it is possible to generate some pretty decent base shapes for further processing with this tool - it could also be improved significantly
Imo the big disadvantage of Designer is that its manual tools like vector draw or bitmap node with brushes are inconvenient as hell vs Painter or just Photoshop . It sort of forcing you to do everything procedural which sometimes may take you 100x time and still doesn't look right when few manual touches could fix things…