Mirrorless performs its AF using the image sensor itself. DSLR does not and requires calibration. Also, if there is any focus shift when a lens stops down, a mirrorless can be take care of it by focusing with the lens stopped down. If you do the same with a DSLR, the view in the view finder will likely be very dim.
IIRC, newer DSLRs on live view mode can also stop down to whatever aperture you set if you hold the DoF button so you don't need to use the optical viewfinder plus if you're in auto ISO, it will automatically adjust that to maintain metering just like using an EVF in mirrorless. Then again, I don't think there's enough data yet that mirrorless can work well with extreme wildlife photography (on muddy or murky conditions, extremely fast moving subjects, etc.) unlike DSLR so maybe that's still an area where DSLRs are still dominant