The main important thing of the confidentiality is the security who is having or holding a bitcoin, why? Simply because bitcoin is a digital currency meaning there are a possibility that it may fluctuates very high and when that happens the person who is holding the bitcoin becomes millionaire and as an millionaire you need to have the confidentiality in order for you to gain the security that you've needed.
That is quite of a wet dream of many that didn't really came true for most, isn't it? Assuming that BTC's volatility makes anyone who's holding it a millionaire is quite silly - did you become a millionaire from holding BTC? Because I've been doing it for 7 years and I haven't..