Ask Fissoa how it worked out for them.
And yes, I stopped listening to "this is going to destroy the game" whining about 6 or 7 years ago.
It's not because it fails for one case that it is impossible.
Falkirk is a one-city realm, for whom it would be foolish to send an army abroad due to the still-existing sea route from the old system and due to the fact they are at war with a neighbor.
On top of that, Fissoa is a relatively small realm, with no big cities or significantly rich regions. Their army is small, and even if Falkirk's army was away it'd be questionnable if they could have taken on Madina city by themselves.
These are not the scenarios that raise concerns. What raises concerns is for the possibility to send 40 000 CS or more, on a realm that doesn't have all of its forces constantly around the capital (either due to being larger, or to be active abroad).
