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You lose some. Some people find them important, I do not. You would lose the Samsung health monitor, which includes the ECG function, the sleep apnea detection and, if it's ever approved, the BP monitor. The ECG is only useful if you alteady have A-Fib, as that's the only thing it looks for. The sleep apnea funtion is only a two day test and, IMO, most people already know if they have it. All other health app functions will work, although I am not sure snore detection will work on on non Samsung phones; when I had my watch paired with a non Samsung phone, snore detection wasn't developed yet. Otherwise, sleep tracking works fine.
I don't know anything about the One Plus, but it worked just fine on my Asus. Didn't even know I was missing anything until I got the Samsung phone and, as I said, the only thing that you don't have access to on a non-Samsung device is the Samsung Health Monitor. All the trackers, HR monitoring and blood oxygen work just fine. All other features, such as notifications, phone calls and apps will work as well as long as you are connected to the phone via BT and/or have an LTE version. You will be able to make and receive calls from the watch if connected via BT or remote connection even if you do not have an LTE version.
Apple refuses to "compromise" the coding to their network by allowing cross branded devices to function. They refuse to even clear up the whole group SMS debacle their phones cause despite all companies begging them to cooperate a fix for us, those who pay thousands of dollars to frustratingly put up with these glitches caused by one arrogant company. Open source is here and seems it would be exhaustive fighting it, yet Apple seems to love a fight...
