SSO being the single point for security is the entire point.
Compare that to every application having a login mask and querying active directory. There are so many more points of failure. If even just a single application has a vulnerability, then an adversary can just log the credentials and hope he finds one with elevated access rights.
Compare that to every application having a login mask and querying active directory. There are so many more points of failure. If even just a single application has a vulnerability, then an adversary can just log the credentials and hope he finds one with elevated access rights.