Huh, that shouldn’t happen. Whilst Samsung gatekeep certain features for its models only (like ECG for instance though one can bypass it by sideloading the SHM Monitor app from XDA), basic features do work fine with most models. I have a non Samsung device as well.
The watch getting too hot is a problem. I have seen it slowing down it’s charging speed (if not outright refusing to charge) in summers here.
Not necessarily. Pixel phones are still very good at photography and crucially, will get 7 years of software upgrades. I would be surprised if this phone hits anywhere close. 165Hz IMO is overkill (heck, many argue 144 Hz on Motorola models is high enough as well).
That being said, the 80 W fast charging does blow away the Pixel (but then many entry level phones as well. The Pixel Pro has 27 W still right?) and raw benchmarks would be higher as well.