Originally Posted by
RChung
When I first got one, it helped me achieve my goal of getting faster.
Later, it helped me achieve my goal of not getting slower.
Now it mostly helps me keep an accurate record of my decline.
This mirrors my experience

, as a middle-aged cyclist. The power meter for me at this point is more like a motivational tool plus cadence sensor than anything else.
For my daughter who's a budding triathlete, she did a FTP test just a few weeks ago, and already, she's training harder with the power meter than she ever did with HR. She did a 30-mile rode last weekend and already her entire ride power was higher than FTP with 5 min power in the 4w/kg range. Apparently seeing numbers improve helps motivating her, just like us middle aged cyclists too.