None of which alters the fact that this is one of the most ridiculously meta-gaming suggestions I have ever heard.
Then tell me, is writing a message meta-gaming, because you know it'll arrive in real-time despite such things not working IRL?
There's a clear distinction between using the tools available when appropriate and using them because of how they differ from what real life would make them work like.
Please elaborate on why you think it is metagaming. I've already asked this, and you content yourself with saying "this is bad", without justification. I'm starting to think some of you you are just starting to stalk me to shout "but isn't THAT metagaming!" at every thing I say.
None of what I suggested, as explained in my previous post, would be done or justifiable by how the game mechanics work as opposed to RL. You could perhaps claim "power gaming", which is very different from meta gaming, but I'd disagree with you then too because 1) it costs so much there's nothing powerful about it and 2) what the hell else is the feature even there for?
Some factors, like the fact that nobody can take action against the family mansion, aid the action in being more potent. But that's just an extra. You wouldn't move your mansion because it's untouchable, you move it because it'll allow your family to go meddle in other people's stuff. Just like writing messages. You don't write them because they are delivered in real-time, you write them because you have something to say. Doesn't make the real-time bit any less potent, but still doesn't make writing messages meta-gaming.
Meta-gaming is all about justification of intent. Are you doing something that you would not do IRL because of how it differs in the game-world? If yes, then it's meta-gaming. If not, then it isn't. It can be a whole lot of other things, but it's not meta-gaming.
And a whole bunch of high noble families in the middle ages sent their family here and there, everywhere, to exerce influence in foreign lands. So it's totally something that is justifiable IC.