Heavy is a 100% subjective word. To give your opinion, you don’t need to try to invalidate others’.
I believe OP’s question was not really how to shed weight, but just if others have had the same issues and gotten used to it. But to respond to you, the other ways to shed weight are to get rid of the glass back if wireless charging isn’t a priority (or if there’s a way to do it without glass), or simply downsize the phone. These, or even plastic, are not invalid preferences, though likelihood is a completely different story.
Who complains for no reason? People complain because they have complaints, whether big or small/petty (subjective). Also in this case, are you saying OP’s wrist pain is “no reason”?
Not quite sure, are you saying OP asking if others have had the same issues but gotten used to it is borderline trolling? Weight is a very common complaint about phones these days, by the way.