Answer
The most common gaps are shared or rarely reviewed privileged accounts, weak visibility into special authority use, inconsistent exit point controls, incomplete alerting, and audit logs that exist but are not turned into actionable review routines. Mature environments often look stable right up until someone asks for evidence of who can do what and when that access was last reviewed.
Buyers should look beyond MFA alone and ask whether the software improves access review, privileged user oversight, audit retention, and event visibility. If a tool only adds another login prompt without improving accountability, the larger security problem remains.