ORAM is pretty costly for a feature that many people don’t actually need. Yes it is log(n) for reads and writes, but the bigger downside is that ORAM by design

ORAM is pretty costly for a feature that many people don’t actually need. Yes it is log(n) for reads and writes, but the bigger downside is that ORAM by design thrashes any cache you happen to be using. I imagine this would be particularly noticeable for filename resolution with deep directories. Plus, ORAM provides no protection out of the box for timing based attacks.