X has rolled out a brand new feature related to DM interactions, with a new ability for users to swipe right on any DM within a chain to directly reply to it making it a bit easier to respond to a message.
Additionally, back in May X also added the capacity to reply direct to a specific message within a DM thread.
While it will not replace the traditional methods of communication within a DM or chat, it certainly optimizes the current process.
The bigger headline seems to be that X is laying the foundation for implementing both audio and video calls sometime in the future, furthering the optimization of user-to-user communication ont the social media platform.
There is no info, at this time, that provides more insights into whether or not the audio/video components will be a part of X Premium, or for all users.