The Legacy menu houses our older chat styles. As we release newer, more advanced Chat Styles, like PipSqueak & DeepSqueak, you may notice some of the other chat styles will move to the Legacy Menu. At this time, you can still access these chat styles from the Legacy Menu if you wish to use them.
Yes, eventually. We plan to fully deprecate all Legacy chat styles in the future. But before we do, we'll take the most engaging elements from them and build those traits into newer, more advanced chat styles designed for the future of the platform to ensure that you can still use your favorite parts of the chat styles.