What are Spartans weaknesses?

I must ask, regarding the ancient Spartans, what were their vulnerabilities that their adversaries could exploit? Were there flaws in their renowned military strategies or in their society's structure that hindered their dominance? Were there emotional or psychological weaknesses that they struggled to overcome in the face of adversity? It would be intriguing to delve into the complexities of their shortcomings and understand how they shaped the outcome of battles and the evolution of their civilization.