Temporary containers are the final solution to cookie based tracking, just like how forwarding services like Simplelogin (not affiliated) is the final solution to email spam. They have very similar underlying principles: reduce exposure by reducing the power you grant and starting afresh every time to avoid information leakage. With temporary containers, only whitelisted sites can have persistent storage and they are isolated by containers. All other sites can have cookies only within the same session, after which temporary container cookies get cleared. Combined with general content and script blocking solutions like uBlock Origin and resistFingerprinting, we can have reasonably good privacy.. for now at least, until the trackers catch up.