Not at scale. If our auth caching stops, our auth servers can get overloaded at peak times. Granted, horizontal scaling auth is a better first round choice, but

Not at scale. If our auth caching stops, our auth servers can get overloaded at peak times. Granted, horizontal scaling auth is a better first round choice, but caching gives you vertical scaling when you are hitting limits on your database. Another option is z-scaling, but that is really just a way to improve either of the previous two (have different pools of user databases).