Well, you can also attach a wonderful portrait lens like the 45/1.8, or an ultra wide zoom like the 7-14/4, 9-18mm, etc, and any number of other specialty lenses. The 12-50mm rather than the 12-42mm wouldn’t add much more weight in any case.
So yes, adding more lenses costs more money and means more weight, but it gives you a lot of options that a fixed lens camera does not. I fail to see the logic where interchangeability is a bad thing, it’s simply different. May be better or worse depending on needs. Different doesn’t mean incomparable either, if there weren’t differences, there would be no point to compare in the first place.
A Nikon 1 system camera with 70-300 would merit comparison as well if you’re looking for extreme reach tele in a small package.
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.