I have to ask though, why would you get a 3rd party screen for an iPhone 8?!
All of the 3rd party pricing I’ve seen advertised here in New Zealand, for iPhone 7, 7 Plus, 8 and 8 Plus, have all been more expensive than getting a genuine apple display.
And how do you know your iPhone is still going to be water resistant?
All the 3rd party screen replacements we’ve seen come through our store haven’t even had the adhesive replaced!
And why do you think they’re now coming to an authorised Apple service provider?
Because they're having issues with their display!