That would involve an adaptor, introducing a whole second set of mount tolerances/variance, which would give only the native mount lens the advantage. We are trying to give every camera a fair fight here.
Also, a camera is only as good as the lens in front of it. When we use lenses from a cameras native system, it potentially shows what a customer is going to get out of that total package. With sensors getting as high resolution as they are, we definitely need to consider updating some of our glass, and are working on that now.
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.