Fingerprinting has lots of flaws like you mentioned. Too many people have similar devices for it to be the primary way to track people. It is really a backup

Fingerprinting has lots of flaws like you mentioned. Too many people have similar devices for it to be the primary way to track people. It is really a backup method of tracking that works some of the time based on a probabilistic match. Your IP address is also a big factor in finding a match.