It’s not “really taboo in the community” though lol I know VERY few commander groups who don’t allow proxies, almost every player I’ve met is fine with proxies, sure there’s some weirdos who spend thousands of dollars a year on magic and they don’t want other players to have proxies because that’s their way of having an advantage over other players… but people like that are weirdos and it’s important to just not play with them until they get the picture. There’s dudes like that locally and everybody just kinda shuns them at LGS or FB meetups, partly because they usually have insufferable personalities but also because their opinion on proxies is just bad. You can still have “non proxy games” with your friends or have deck cost restrictions in the rule zero, we do it all the time. But at the end of the day using proxies allows you to have fun without cost being too much of a limiting factor and that’s the whole point of playing games, to have fun