Some of the better mirrorless cameras have some extra moving parts, for the anti-shake mechanism, which is capable of moving the sensor around to cancel out the

Some of the better mirrorless cameras have some extra moving parts, for the anti-shake mechanism, which is capable of moving the sensor around to cancel out the movement of the camera. Yes, you can do anti-shake in the lens, but I think there are some advantages to having it in the body as well. My camera isn't a mirrorless, but I'm actually glad it still has the focus motor inside it, because that means that I can go and buy an old cheap (but still good) second-hand lens that still uses the mechanical focus gear, and get autofocus. Some other camera bodies don't have that motor, so those older lenses are manual focus only with them. With the mirrorless, by dint of having a brand new lens mount, they were able to mandate that each lens has its own autofocus motor, but I just thought I'd point this reason to have more mechanical stuff in the camera out. And of course I also have somewhere an old film camera where absolutely everything (except the lightmeter) works if you take the battery out. Quite how they got the precision to be able to set shutter speeds between seconds and 1/2000th of a second is quite beyond me.