I recieved 2 of the three phones I ordered.
Samsung A20: Actually not that bad. It has a lot of visual settings and a built in night mode. Changing the brightness seems to have an overized effect on the eye pain but it seems decently usable. Going to give it more time. This has an AMOLED screen
Samsung J4+: This has an IPS screen and it is much worse.
Interestingly when dark both screen seem worse then when showing white content.