I have made many things using Kreg joinery and products. I made a little investigation into whether glue is needed and it was about 50-50….so I quit using glue. I quit because plywood is so cheap anymore and if I blew through a top layer veneer I could just stick a new one in and keep going. I have a photography studio and it is populated with cabinets that have little or no glue in them and the strength of just the joint itself is over the top, and we have never had an issue. Now as far as true joinery of wood working I suppose someone could build a case that it is a fad or cheating….but couldn’t that be said of Festool dominos, everyday plate joinery, even using a machine to mortise, or a tenoning machine for you TS? I personally have seen some very nice cabinets/furniture that have been made with Kreg joinery, as long as they are hidden….who cares? Is it against the rules? Who made the rules?…..
Just my .02
Mike

Mike