I do agree on the sabotages features, especially it can be use on someone who out of sudden noble one of the barb in your province or even low points village and put like 100K HC in there. Thus, this feature can prevent this from happening, by shutting down and unable this village to build any church inside. Or even if this player managed to build a chapel inside, sabotages can be used to severely damage the village, and academy cannot be built thus it eliminates the risk of short range noble train. This is what I think the good side of sabotage feature
However this has been abused by several tribes as they team up and launch sabotages attack on 1 player, where they can destroy full developed which is 10k points village to the ground PER DAY (or even more!), even with homeguard effect (assumed tavern still stay at lvl 15 till the end). The player itself is unable to defend himself and there is no way his other tribemates can help him. Besides, when sabotaging a full developed village, the cost to rebuild it is way more than the cost to rebuild the spies (high level building cost so much! Especially Hall of Order!), not to mention there is no risk involved from the attacker side. Even with the new homeguard feature, I don't see it helps in this scenario.
Here is my suggestion:
1) If your tavern is lvl 15 and your village points is above 9000, your village will be immune from sabotages
or
2) If your HQ is lvl 30 and tavern is lvl 15 as well, your village will be immune from sabotages
In this way, not only we can keep the good side of this feature, it can as well stopping players or even tribes abusing this feature.
Thanks for reading!