What are you still doing "just because"?
There are so many examples of laws, sports regulations, and industry practices that served a purpose when they were created, but they persist despite no longer making sense, and despite the fact that the rule-makers are long dead.
Being a non-conformist doesn't mean walking on your hands just because everyone else is upright. But it does mean questioning whether the things we do, including popular beliefs and practices, are still serving the greater good.