There are any number of reasons why it’s sometimes a good idea to roll with a write-now-send-later approach to emails.
Maybe you’ve got a big personal announcement coming up, but it’s happening at a very specific time when you won’t be around. Perhaps you really want to rave to a friend about everything you loved in Spider-Man: No Way Home while it’s fresh in your mind, except they’re not seeing it until tomorrow.
It’s equally helpful at work. Many of our employers have people spread out in different time zones across the country, if not the world. For email-heavy jobs especially, something you send during an Australian co-worker’s overnight may get buried; but if you schedule the send, you can ensure it pops up when they’re actually awake. Sometimes, too, it’s just momentum: You’re working hard, rolling through deadline after deadline, and you want to get a jump on future business.