My point being, even if they replace the display in store for you, you still take the risk of them exposing the phone to have dust underneath of it, and being that you’re someone that’s very particular about your displays, do you think that’s worth it to you with one speck of dust on the bottom of your display?
Here we are, in 2019, with the glass and the LCD having been fused as one unit for years, and people still make this claim that there is some sort of "risk". Now, if there was dust incursion when they were fused, then yes, it might be a problem in the replacement part, but the act of replacing the screen does not introduce dust.