For me a big advantage of mirrorless is that it works really well with a variety of vintage glass including rangefinder lenses and you essentially always get WY

For me a big advantage of mirrorless is that it works really well with a variety of vintage glass including rangefinder lenses and you essentially always get WYSIWYG image composition like depth of field preview on a dslr but without dimming the finder and also allowing you to adjust exposure in camera. Shooting portraits with a z6 and a 60 year old 90mm leica lens on a megadap autofocus adapter (it just moves the whole lens in and own) yields some really cool images.