I watched a lot of battles in AoE 2 and what a lot of players do in PvP mode. So it doesn’t leave me cold.
Rather, I think this tactic is a pigsty.
quick attack by building a castle or towers at a foreign base …
I would definitely be in favor of it not being possible in AOE 4 at all.
The castle and towers would only be allowed within a certain radius of the main building.