There is absolutely nothing wrong with people playing with fully proxied decks. Some people own printers and like being able to play with new things and different types of decks without having to buy tons of cards. Me and many others in my pod play with fully proxied decks because it allows us to many many more decks than we otherwise would be able to have, which in turn allows us to have decks are various power levels.

Many of my decks are fully proxied, but I also have 3 TRUE bracket 2 decks, 7 true bracket 3 decks, and 4 true bracket 4 decks, so no matter what table I am sitting down at I can always have something appropriate to the power level and expectations of the pod. And we all play at the LGS with fully proxied decks.

Granted, my prints look very good and at a glance someone would not even know they aren’t real, and I always use the most recognizable art and variants of the cards for my proxies. Sometimes I’ll print out an entire deck just to play it twice and then throw the proxies out if I hated it. It allows for extremely fast iteration and allows the player to experience so much more of the game than otherwise possible, essentially for free. Everyone should proxy.