But obscurity has been good enough for privacy. Just look at the difference between a GPS tracker and assigning an FBI agent to follow someone.
In theory the information you gather is the same, but the ability to do it at scale allows you to collect data on people that you otherwise never would have, thus reducing privacy.
It has been mostly good enough for most people, but not anymore. And that's a consequence of technological progress that we are not going to change. The sooner people realize this, the sooner they can start fighting for real privacy.
In theory the information you gather is the same, but the ability to do it at scale allows you to collect data on people that you otherwise never would have, thus reducing privacy.