Time to stop glorifying the Polar H10 chest stap?

Is the holy grail Polar H10 not overestimated as far as accuracy is concerned? We have all kind of studies about heart rate variability with the Polar H10: https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=polar+h10+heart+rate+monitor&btnG=&oq=polar+h10 But we have also a heart rate variability study about a Cyton 3 channel ECG device which is eventually more accurate than the Polar H10: https://www.sciencedirect.com/science/article/pii/S2405844021012512 …