well you have to get those fine rip blades when you want to do that. if i'm at work or school they usually require me to join a sawn edge (at school we have 4joiner planers and at work we have 2 joiner planers). i dont like to when its either going to get shaped, rabbited, tongue and grooved, routed, or sanded. but if im gluing up say a cutting board with biscuits and a plate joiner i defiantly join an edge. time is money as you know! but the quality of work is more important.