What are the disadvantages of crenellations?

Crenellations, while providing defensive advantages, have several disadvantages. They can be expensive and time-consuming to construct, requiring skilled labor and materials. Additionally, crenellated structures may limit visibility for archers or defenders, potentially hindering their effectiveness in combat. Lastly, crenellations can create a false sense of security, leading to overconfidence in defense strategies that may not be sufficient against modern weaponry.