@vinc14 you clearly do not understand what is HRV good for, it’s not useless. It’s not about comparison with other users / people. It’s about your personal range and trends connected with it. For example my range is 32 - 45, my wife has HRV above 80. It’s genetics, everyone is different. But I can follow trends within my range - i.e. when I am sick, my HRV is going down, bellow my minimal range and it’s an early sign that something is wrong. It’s not about one value, but trend over time. There are a lot of articles online, I’d suggest to read up on it and not to make such bold statements that it’s useless.
From the way you ask questions I have the impression that you don’t spend much time with your own research, do you?