Why would they be hesitant? Complex user experience?
I'll admit I've never scheduled a message for later, other than on Twitter since I've lived in some awkward time zones relative to the bulk of my mutuals. But I can't come up with a reason why Apple wouldn't want to add it.
I'll admit I've never scheduled a message for later, other than on Twitter since I've lived in some awkward time zones relative to the bulk of my mutuals. But I can't come up with a reason why Apple wouldn't want to add it.