You're not making any sense - you're claiming Google tracking is magic? Google, Facebook, or any other website doesn't get OS-level tracking, and are stopped cold by a generic adblocker.
Blocking OS-level tracking is a security issue because the third party software can be bought and sold to malware companies, who can push an update to infect your computer.
You're right, it's not.
> I'm not sure how you're equating cookie-level tracking to being more invasive than OS-level tracking.
Google does far more than cookie level tracking. What do you think Google Now use? Magic?