* Negative information about you floating free (mugshots websites, revenge porn, news articles about past behaviour) * Health and other behavioural information (e.g. used by health, life and auto insurance. These days your medical info might be used to sue you in another state even!) * Privacy in semi-public places (ring cameras, uber dashcams) * Financial information being used against you (credit ratings obviously, but also being deemed a fraud risk makes a lot of transactions difficult) * Criminal history is commonly used in job applications.
I'm not saying we need to go to one extreme - how would loans work without credit ratings, and CCTV definitly improves safety in some situations - but I just want to point out the range of issues at play. Most of these already have some kind of legal compromise.
Also beyond practical concerns there is a principal at stake too. We fundamentally deserve some degree of privacy just for it's own good.