I personally favour not having a dress code. It’s just that I don’t dismiss dress codes as having no purpose. They have a purpose, it’s just not one I agree with.

In a related area, PayPal once no-hired an otherwise qualified engineer because when asked what they do for fun, the candidate replied “shoot hoops,” and PayPal’s cultural belief was that “No PayPal engineer shoots hoops.”

I would never work for a company with cultural filters like this, but I can understand their reasoning even if I deeply believe such workplaces are toxic monocultures with a side of racism.