I think it’s great when Intervals.icu picks up on a new threshold heart rate, and i find this matches my power zones quite well.
But other than getting the notification of when it goes up, where can i view what it current is (eg 12 months after it last went up) and see any decay?
Similarly to the eFTP where it gives a current estimation, and its decay over time.
You can see the current value for each sport in /settings but it is manually captured. I am not sure how threshold HR changes with time. Even with eFTP the decay is a bit of a thumbsuck and it best to do max efforts every now and then to get a good number.