This is actually mis-information. Text Chat has never been available on Xbox at a platform level (Our Xbox app is over 3 years old). This is due to stringent privacy policy implications that require us to add additional complexity to Text Chat. This change does not impact other platforms.
If you wanted Text Chat to be available on Xbox you had to fork the ChatScripts and then modify them in order for Text Chat to be visible, and work properly. This requires overhead from a developer, and was never intended. While it has been possible previously, in order comply with Xbox standards so that you may continue to ship games on Xbox we needed to prevent Text Chat on Xbox from being possible.
As for your other concerns, they will not be addressed here, as its off-topic.