Comment Re:I used a mirrorless 15 years ago... (Score 1) 93
I once used a Mamiya 645 1000s camera with a huge viewfinder, and now use a Fujifilm X-T3. While the Mamiya certainly had a very large bright viewfinder to focus from, the screen resolution and the viewer magnification of the X-T3 is bright and sharp enough to see if my focus is good.
Having said that, X-T3 has other advantages which a mirror does not have. First, the X-T3 can magnify the screen so I can fine tune the focusing even further. Second, I can show a histogram to see where the exposure is while evaluating the shot. Third, don't have to worry about mirror slap vibration for show shutter speed shots.
I don't know, mirrors are good for focusing, but I've seen bad DSLR viewfinders and mirror-less. But I'm warming up to mirror-less with the newest iterations and using it exclusively now.