Ideas to stop mass castle building for DOM_3

[Turin]

Well I just wanted to point out that in a game where raiding isn´t so effective, building mass castles would be a stupid strategy. Right now every province with a temple, 3+ gem income or more than 50 gold/turn needs a castle once conjuration 9 is researched.

In a regular war mass castling doesn´t help much. You won´t be able to man all castles and it just takes one more turn for the attacker to grab the castle.
In a way mass castling without enough troops makes you an attractive target, because the attacker has much more to gain.