Add message notification for "regiment finished recruiting", "ship finished building"

[Wizzington]

I don't know that a notification for every built army/ship makes sense, but one for subjects sieging definitely does.

 

[Wizzington]

The messages interface is already cluttered, adding every single notification anyone could possibly think of would make it more so. When considering whether to add something to the game, the question should be 'why', not 'why not'.