Thanks, I think you just confirmed my point and the point of the OP again that manual focusing in magnified live view is poorly implemented and imprecise with the GFX. You just feel that there is a workaround by always turning on focus peaking in combination with magnified live view and then adjusting the sensitivity (and possibly the color) of the focus peaking. That may work for you, but if the magnified live view functioned properly in the first place, all of that wouldn't be necessary.
It may not work the way you want it to work, but, for me, it works fine. If I can find a convenient way to make a piece of photographic equipment do the job at hand, I don't worry much about how it could have been made differently. BTW, I use peaking on the D850 and the a7RIII, too, so there's not much difference there. I do think the GFX press/turn control is the best way to control magnification of the three camera families.
I actually find peaking sufficiently useful that, when I was using the D810, I sometimes hooked it up to an Atomos Shogun so I could use the peaking in the Shogun. Now, with the D850, I don't need to do that.
Jim