I didn't say that those tools don't have a point. They provide compression. That helps already injured joints and such function. Compression does a lot of things, including stopping pain and inflammation. As for shirts helping you use your tris and pecs, then do flys and skull crushers. And they do assist with the lift massively from off the chest. I lift elbows tucked and my shoulders barely get any work already. In a shirt it just eliminates it a bit more. Shirts, suits, belts etc are a bit like a tow cable in swimming. It gives you an idea of what performing above where you should feels like. And ultimately, for most, results in injury. If you have an injury, and need them to stop from aggravating something then you are using it as DME and not a work out tool. If I have no legs, but decide to run, it doesn't make my robo legs not DME no matter how performance engineered they are. As for the thought of, if one guy has a shirt every one has a shirt, dthat isn't always true. If you used them you know different padding inside the shirts and how many lifts you have used them for will make a HUGE difference. And while trianing it's best to not lock out hard anyway. So maybe that is one benefit a shirt can teach you.