A real world scenario of this happened. 3rd party iPhone screens were using the controller chip from the previous iPhone, but it still worked fine. Until a new

A real world scenario of this happened. 3rd party iPhone screens were using the controller chip from the previous iPhone, but it still worked fine. Until a new iOS update released, since that iOS version wasn’t going out to the previous iPhone, the driver for that controller got removed since in theory there would be no devices using it anymore. Causing all the replacement screens to stop working until Apple added the driver back.