Without insight into what the AWS RDS team workload and priorities are, I think it's unfair to use a term like disturbingly. Sure, as a user, we want features to be rolled out as quickly as possible. From what I've seen, Postgres RDS support has been slow, but consistently getting better: nothing to warrant suggesting Amazon isn't serious about continuing to improve their Postgres offering. That would be disturbing. Or data loss failures. Slower-than-I'd-like roll-out of new features? Frustrating.

By all means, RDS isn't perfect. It doesn't suit my current needs. But I understand that getting these things to work in a managed way that suits the needs of most customers is not an easy task. I'll remain frustrated in some small way until RDS does suit my needs. I hope they continue to add features to give customers more flexibility. And from what I've seen, they likely will.