To me its having all the information right there in the view finder. Blown highlights are shown as zebra stripes. Manual focus is super easy due to focus peaking. And if you really want to fine tune your focus, its just a matter of zooming. How the sensor will "see" the image is right there before you click the shutter. No shoot then chimp to see if the camera interpreted our negative 1 stop adjustment how you thought it would, its just right there. Histogram... right there too.... no looking down and back up again. I have moved to shooting manual exposure about 50% of the time because I can see the impacts of changes without ever taking one shot. I know before I shoot.
Yes, silent shooting is very cool, but I shoot sports and events, and only the A9 can reliably shoot fast moving objects without impact using silent. Fortunately I don't shoot golf - last time was Pinehurst for the US Open. And other sports it just doesn't matter. And even then, the shutter is still more quit than just about every dslr simply because there is no mirror slap.
Pretty much every other aspect of shooting is the same. But the EVF..... i was a doubter..... but I love it. For me, that was the game changer.