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.
Trust issue, I don't want to fill up KYC form if I don't trust the site or anyone asking for it but seriously I'm already exposed on many things and it started with Banks along with my personal social media accounts, even google already sold our information so I guess filling out KYC should be fine as long as you are dealing with the legit site, but if you still want to insist to remain private, then you have the option to decline and look for alternatives. We can't also deny that many scammers/hackers don't want this kind of feature, this can ruin their illegal business.