So my friend and I were talking about this game, and we thought it would be cool to be able to schedule messages for the future. i.e. Scheduling a taunt for when your sub launches.

What would the other practical uses be?

That's a fair question, but I feel as if the practical uses would change from game to game. I'm not going to say I know exactly how people would use it, but I do think it would be used.

I asked because I couldn't think of one.

You can also tell your friend at which hour your sub will go, and he will keep a note on your profile to remember it. It's the same thing, i think a message isn't necessary