Thanks for the context. I almost got lost but then the context helped a lot. I, No, Yes, Nowhere, Well, Please, What, But...tell it all.
My main (by far) wildlife subjects are peregrine falcons, the fastest creatures on earth. I don't have any faith in your ability to understand from an image how fast and unpredictable their flight is. So for a start, while I'm picking out some images, do a google search on the terms: "peregrine falcon 'stoop'" You can see a large number of images of fast moving peregrines among the images shown.
With their wings nearly outstretched, peregrines can soar way faster than the soaring of nearly all other birds. When they assume the "cupped wing" form they go even faster, in the "delta form" with wings folded tightly the speed is astonishing and the ability to turn on a dime is still there. All of these show up in the google search I recommend above.
So, look at a few images from the web while I skip over the images of feeding chicks, the fledging of juveniles, mating and fighting in the air with intruding raptors. The fighting with intruders includes some very chaotic action in the air but you'll probably assume it is all stationary so I'll skip some of those.
Check back in a bit. I'll put up some recent high speed flight.
I believe you at this level of hunting, any LAG especially if it is inconsistent with some out of timing frames here and there, and varying lag, and not in the latest best EFV, affects you. Surely, part of it is adjusting to some minimal lag. The other part is reducing the annoying variance in lag (more lag, less lag, more lag, less lag), the skipped frames (few updates, more updates, fewer updates, more updates) and then the killing frames (at certain part in the pipeline, an update is produced, but there's something blocking from finishing the write in the EVF buffer, making it display out of sync). This would be put to the test in high speed AF-C with these falcons. I believe you, because I have experienced this lag in other contexts. I don't think I could have explained this lag to anyone that hadn't used the equipment at this level of demand...all this lag, dropped frames, varying lag, out of timing writes, etc. are invisible to anyone at a different pace. You are operating not at the normal reaction time. Part of the neurons for making these decisions fire instantly...there is no thought. It's a model you built.
Now, even if this makes you frame things 10% worst, or 25% worst. It does require sacrificing zoom power to make sure you get it in the frame. But probably, if this happens to you, it also means your experience is very frustrating. Does it infuriates you that you seem to be set off track, confused or just annoyed? I remember how extremely annoyed I'd be playing extremely short reaction time games. Infuriation would be a mild way to describe it.
However, for cars, planes, normal birds in more normal flight trajectories, I am sure in a newer camera like A9 would be a pleasure to shoot with. It's just when these objects have sudden turns, at very tight tolerances (framing) and you are using your learned "muscle reaction" algorithm, combined with stressing the processor bandwidth (AF-S high for quite some time) that this can show up an full display.
Even the person develops complex neural algorithms which are tuned, and there's absolutely no thinking at all all, and send a very complex set of moves which are all in prediction and catching up with the subject. With a minimal lag, and variance of this lag, all this neural automation crumbles.
However, this means nothing to 99%> of cases, and especially those cases that don't involve a high speed chase at that level of reaction, with the subject doing this unpredictable twists.
Do you sometimes instantly anticipate how the bird flight might change based instinctively on how it's body and winds are exactly shaped in the current frame? If you've built this level of anticipation and prediction in your brain, and the EVF has some variance of lag, missed frames, out of time frames as it pushes 30MP 20 times per second, I believe you until we can have some benchmarks!