I don't use Training Peaks. Same reason I don't use a power meter. Waste of money and time for me. At this point it's like those 1970s high school kids putting Edelbrock headers and Cherry Bomb exhausts on a rusted out bomb they bought for $75.
I'm not in my 20s, before injuries and illness, at an age when recovery comes naturally and methodical training will result in consistent improvements. After a certain point that doesn't apply any more, no matter how much we try to tell ourselves it matters.
While I pay attention to a reasonable amount of data, there's no cost effective benefit to throwing money at diminishing returns. I don't need that much data to tell me when I need to rest and recover or switch training methods to address chronic injury problems. And I don't need special equipment or data to tell me when I can push harder. I'll know it within 15 minutes of warming up.