There are a lot of various ways to make joints from flat parts, and never all are limited to laser cutters, but loads of the methods have about from fields like woodworking and metalworking. Mortise and tenon joints are similar to finger joints, apart from the "fingers" on 1 piece https://remingtondloqt.ageeksblog.com/34350438/cnc-mills-for-small-batch-production-an-overview