Question about mirrorless

[Major Nikon]

11. So do all the manual DSLRs

Most of them can either use the dedicated prism AF sensors or they can use the digital media itself in live mode the same way a mirrorless does. Either way it’s still a digitized focus reference whereby using a split image focusing screen is purely optical. The advantage is you can more easy search for a focus point with more contrast as opposed to digital methods which can be quite literally a shot in the dark. Depending on whether or not you have a split image screen and your level of skill using it you might be able to focus better in certain conditions.

It used to be it was relatively easy to beat auto focus, but modern cameras have gotten much better in low light conditions and with an IR assist can potentially beat anything you could do manually.