I get that it goes against the fundamentals of crypto currency, but exactly for what reasons though? Assuming you're not using it for anything illegal (if you are then it's understandable), why the concern? I'm asking specifically when trading.
Have you seen so many hacking incidents on the past? They could get all your data if they want to and especially if the exhanges have data stored in their server which makes your real life data in danger. Those hackers usually using your data for crimes, which is why your data is valuable even the little one such as your date of birth.