We take on risk every time we decide to wake up and start the day.
I live in a place where I’m considerably more likely to get hit by a car while walking than thrown in jail as a political prisoner. That doesn’t mean I’m never going to go for a walk. I’m going to live life.
Leaving my phone at home seems pretty silly when the risk is very low in my nation and I do riskier things while cooking dinner.
Oh, in day to day usage I agree with you: we’re all one little uninteresting datapoint in a whole lot of datapoints and there are plenty of other ways in which we are tracked.
However if you’re part of a Political Party or Movement and/or attend demonstrations, it’s probably wiser to leave the phone at home, if only because that makes you stand out as a much more interesting datapoint than average.