I had never heard of those referred to as a Dutchman joint. I have never used one in my woodworking projects but I understand the technique of integrating them. I like them for their artistic beauty along with their functionality. I have recently been making Epoxy Filled tables and these are a great way to stabilize wood slabs that have cracks/voids, these cracks/voids are what gives the tables character. I just have not had the piece of wood yet that needs a bowtie but I am looking forward to that day.