While this saves money in the short term, installing a third-party screen immediately voids the Apple Limited Warranty on the display. Furthermore, Apple’s software often "rejects" non-genuine parts. You may see warnings saying "Unknown Part" in your settings, and features like True Tone or automatic brightness may cease to function.
There have been documented instances where iPhone screens crack due to thermal expansion or manufacturing stress, often happening while the phone is charging or sitting on a table. These are hairline fractures that often appear without a clear point of impact. does apple limited warranty cover screen replacement