Garmin max HR estimate, is this data point valuable?

It seems like it outputs just a really random number cause every other ride it estimates a new value at its within 4-8 BPM off the last estimate, up or down.

As a ballpark number its fine I guess, but is there any value it? It changes almost weekly so there is no point in looking at it to set precise heart rate ranges ignoring the fact that heart rate ranges are not that useful anyways (correct me if I am wrong) and it also depends on the actual ride I am doing, sometimes especially over the winter I don't do hard rides, just longer easy ones so there isn't a lot of effort to spike the heart rate