AKA row-level security - my gut says this feature is not too frequently used in SaaS, to the extent it may bust connection pooling, requires synchronization of

AKA row-level security - my gut says this feature is not too frequently used in SaaS, to the extent it may bust connection pooling, requires synchronization of database accounts and application identities, etc.--or else pushing some kind of non-db-user session/security context into each query. Similar issues one would see with MSSQL and Kerberos impersonation of the user principal from the app server to the database.