So... let those who believe it is a characteristic of all LCD screens continue on with that and make their purchasing decisions accordingly... if you think it is something to be concerned with, then make the appropriate decision as well.
What is it in this age where people think facts are somehow a matter of opinion? Because saying every screen has it is just a fact based on how screens work and physics.
If you don’t believe in this you have to prove that our LCD screens update every pixel at the same time or that the photons from certain pixels somehow travel back in time to arrive at your retinas at the same time as the photons from the pixels that already updated did. Because if you cannot prove either of those the conclusion is that every LCD has the effect. The only question becomes how noticeable (if at all) it becomes.