Thanks for your replies! I should just go and state that I don’t use the Garmin metrics in my training and planning. I use the Fitness, Form and Fatigue scores from intervals.icu along with my Training Plan. My point to the original poster was that I don’t see the same behavior he mentions about being way off or conflicting, my experience is that Garmin lines up very closely to intervals.icu.
My statement about the more data you feed it, the more accurate it is, was more a general statement to people who use Garmin and say the metrics are crap and way off. I don’t see it, and often when you dig in to what they are saying they are using some other cycling headunit or indoor app that doesn’t even get considered for Garmin metrics, or they don’t wear the watch 24/7, or they are using wrist based heartrate, or they don’t understand what certain Training Statuses mean and get offended by what it reports, or they are massively overtraining, or flip side, doing way less than they believe they are.
I used EliteHRV for awhile and am embarassed to say I stopped because I didn’t understand it enough to make it meaningful. I wish I did, I’ll read that paper you posted.