That's fair, I completely understand where you are coming from. From a growth/money-making perspective it'd be smart to message customers about new features but table stakes would be something like:
Voice Chat (Not available yet) [Click here to be notified when you have access]
Or something along those lines. It sours my opinion of ChatGPT every time I go to use a newly announced feature to find out I don't have it yet and have no clue when I will.
