Ok guys, I made some initial tests (too chaotic to put it on YT), but to me it looks like different subpixels pulsate a little bit on my slow motion video of various shades of gray. Not something to be 100% sure, but that could mean that FRC is in play with Macbook displays, at least with mine. It looks subtle, but it's possible that it alternates not between black and red, but between two shades of red that this screen is capable of displaying.
Since it's hard to do the filming of Macbook screen put under russian toy microscope and at the same time aiming the phone at the small spot on the scope, I'll have to think of a way to make it a little bit more stable. I'll also try to make an HTML page with JS animation of shades of gray and rainbow changes in order to see how different colors behave on subpixel level. Probably some of them will flicker more, some less, depending on brightness level and where thay land within 6-bit display gamut. Ah, and one more thing - this quick test was made on Bootcamp W10, not MacOS, so I'll have to check MacOS too.