While I love my mirrorless, the ease of "exit" is definitely something that pulled me away from them for quite a while. But times have changes. There are accessory units like the Arsenal Camera Assistant that give you wifi access to the camera. Also a lot new cameras (like my new Nikon) have wifi built in.

Can take photos with the Nikon and beam them to my phone fairly quickly. Is it as quick and seamless as using the iPhone directly? Nope. But good enough that I'm ok with it now. It also gives me access to typically a much higher quality photo that I can crop way farther than I can with the iPhone.