That's...not how software programming works. You can't just take something that was developed years ago and plug it into a new system like you are changing a tire on your car.
I hear you — all features need to be adapted. But Imperator has a ton of features directly ported from EUIV. The siege mechanic is completely identical, as is zone of control. For 1.1 they are porting a ton of features from their previous game. It really just takes tweaking. It can be done, and this is not a valid excuse for features from games of years past to be absent in Imperator.
Not to detract from your point. It is important to keep the reality of development in mind.