Personally it's very convenient for me, because I never have to opt out of anything. Nothing bad has ever happened to me and as a person who knows how the targeted ads business works, I'm confident in saying that nothing ever will. It's seriously liberating and worth considering.

If you think "nothing bad has happened to me personally due to aggressive tracking measures" is at all a reasonable argument, then I can only assume you are incredibly ignorant on the implications of it. I don't despise tracking because I'm afraid Google is interested in me personally. But the implications at a societal level are ENOURMOUS.

When you have data on one person, you can sell them ads. When you have data on everybody, you can change elections, culture, and widespread opinions as you see fit. Even if that isn't being abused today (which it probably is) the fact the Google has the capability of doing that one day is scary enough that we absolutely shouldn't let the practice continue.

Do you have an example? IMO the benefits massively outweigh the downsides. Swaying elections has been done historically with newspaper and television. Fox news is still far, far more influential than Facebook for political opinion. Why is this different?