I don't know where you get your data from (maybe also where you got that the Z50 is weathersealed
) but over here (CamraNu in Urk, Netherlands) the A6500 is 999 € and the Z50 949 € (both body only)
And for those 50 euros you get IBIS, double the AF points and a 3.3 MP more sensor
Also I prefer a rangefinder style body but that's just a personal preference and carries no real weight in the comparison like price and specs.
Every time someone on a forum mentions "good ergonomics" I just chuckle, I find that good or bad ergonomics is either marketing speak or a personal opinion and also carries no real weight in an objective comparison.
And I can get a new A6400 with lens for 989 € there
Bottom line, for me all these cameras are in the same price range and spec differnces are almost insignificant. Choose what you like but this new Nikon for me feels like a Sony or Fuji clone in Nikon cloak. Nothing wrong with that but to try and call it anything more is an overstatement in my mind.