I feel I have a mix of trackers and personal motivation that works for me. You're definitely right, people can and do get buried in numbers and miss the reasons that matter most.
For me it's a mix of using them to motivate myself. I want to run further or faster, and tracking my runs helps me do that. And the heart rate monitor helps me understand what my body is telling me.
I probably worded it poorly. Seeing my high heart rate wasn't a "my heart rate is wrong" moment, it was "what can I learn from this?" What I learned is that may explain why I find it hard to go further, and doing runs designed to strengthen my heart can lower it for all runs. It'a helped me get back to what I wanted: to do more.