I think that, in some cases at least, the blinkers can help reduce symptoms (even if they don't eliminate them), and this can be helpful in increasing the time we can spend with a device or while we are trying to adapt to it.
With the idea that they maybe work by reducing the amount of flicker reaching our peripheral vision (which is more sensitive to flicker) I'm trying a further reduction by partly covering the lenses too. It seems to have improved the usability of the pwm-free Latitude 7390 without having to turn off font smoothing like I was doing earlier coz it helped. More testing required coz I've only tried it for a short time so far.