[davidmanze]

I know that they don't do it for what you say the reason is, Dave.

If you put a red image in place of any of the 60 60Hz image feed, you will not see the red image. That is how fast 60Hz is, and how "slow" your vision is. Thinking that you may frame differently or miss a moment with 60Hz refresh rate is bonkers. If there is an essential frame between 60 per second frames, in all probability you never saw it anyway. Let alone in 120 or 240 frames per second.

Do you know what your (or rather, a human's, not specifically your) reaction time is between seeing something and then moving a muscle (like moving the camera, or pressing a button)? Between half a second and a bit above a quarter of a second. So if keeping a moving subject in the frame depends on 1/60 of a second or even smaller, you never will have a subject in your images.

And, in that reaction time, 20 to 30 images have passed before your finger could blink. And yet, you imagine that somehow half of 1/60th of a second or a quarter of 1/60th of a second will impact the frames you capture. 30 frames or 30.5 frames... that is not the issue. That needs a rethink, me thinks... And drinks don't help rethinks in a meaningful way....

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The lag you have read about in the past was the lag between taking the video and the showing of the video, with longer processing times causing the delay. It was not about 60Hz frame rates.

BC this my last word on the subject .......... I've done some research .....

It is generally agreed that the maximum perceived frame rate of the human eye is 60 Fps ......... some say a little higher .........
What does that mean ??     It means that comparing a constant image and the same image at 60 Hz the human brain can perceive the difference between them, although the brain very quickly acclimatises .......
 But that was never the point I was making, my point was fast subjects in the EVF can have a up to 1/60 sec difference depending on the moment of refresh.
  So as per many of our differences of technical things such as: ........ defense of Canon's poor DR ...... btw. I haven't heard any such defense since Canon upped their game ..... AA filters and their supposed benefits ....... etc ..... etc ..... 

 Moving on ....... I'm buying a house in a small French village in the SW of France (I'm all legal now here after Brexshit)  and the days of frittering silly money on incremental camera upgrades are done for me ....... 

 ........ but even if I had spare money I wouldn't buy a MLC at this point in it's development because in five or six years EVFs will only get better ........ 60 Hz will only exist for bottom of the range cameras ......... 10 million dot EVFs will become common ....... 240HZ refresh rates will be common  ....... colour grading will be better ....... processors will be multiple times faster and the viewfinder experience will be approaching that of the OVF ....... 

  How could I look anybody in the eye knowing I have 3.6 million dot 60 HZ EVF it just doesn't do it for me ..... good though the Z9  is, their next pro sports ML will not be running 60 Hz ........

  Let's make a date in five or six years time and we can discuss the state of the ML  industry .........

  until then have a good day !!