There's literally only a handful of Chinese aftermarket iPhone display manufacturers like Tianma and BOE. In fact, BOE is an official Apple supplier for iPad and MacBook. These displays aren't low-tech products made in the back alleys of Detroit and sold underground.
You can bet Apple is constantly buying and evaluating parts from around the world.
After 6 beta versions of iOS 11.3, Apple suddenly discovers the display bug, tests, and fixes it? Right after third-party display manufacturers come out with a hardware fix?
Let's not be naive.
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11.3.1 wasn't released "right away." It's been nearly a month since 11.3 was released and bricked devices.
You weren't affected because you're not an independent iPhone repair shop or a customer using a third-party display.
From the POV of an independent iPhone repair shop, it's a clear message on using non-OEM parts.