It was not done intentionally. They simply don't QA their releases on repaired phones (because why would they?). The touchscreens in question highly likely use an older touchscreen controller from a previous iPhone. These controllers don't support certain commands that evidently they are now using.
As far as the lightning connectors go, that WAS done intentionally. The third party lightning connectors generally don't implement a very specific charging protocol designed to prevent metal migration between the pins and the pads on the connector. They only implement the handshake. But guess who has to honor the warranty if you've used a non-compliant charger cable?
As far as the lightning connectors go, that WAS done intentionally. The third party lightning connectors generally don't implement a very specific charging protocol designed to prevent metal migration between the pins and the pads on the connector. They only implement the handshake. But guess who has to honor the warranty if you've used a non-compliant charger cable?