Here’s the situation: Lumberyards and hobby/hardware stores often sell lumber S2S, which means the wide surfaces are jointed and planed, but the edges are rough from the sawmill or follow the shape of the tree. Do you pass these boards up because you don’t have a jointer? If you own a router, start buying that
I know circle cutters aren’t a lot of money. But the thought of a steel arm swinging around at face level with a knife makes me nervous. Besides, that single blade tends to tear up the grain around the hole. Buying a dedicated hole saw for every size you may need is an expensive proposition.