You know.... I'm still waiting for Adtech companies to request realtime log shipping on the backend. You'd set up each server type (Apache, HAProxy, Nginx, IIS, etc) as a log ingester type. And from there, you ask the server admin to install a telegraf like tool that securely sends data to endpoint.
Doing this would allow websites to remove all appearances of tracking code. It just wouldn't be there. Sure makes for some strong plausible deniability.