DynamoDB conditional writes are strongly consistent. Defaulting to inconsistent reads was reckless and I would never defend that, but the worst case is non-repeatable stale results, never lost writes.
That's the right way to disclose a dangerous default, but defaults should be as safe as possible, and users should think very carefully about whether they can get away with opting out. Consistency failures can be very non-intuitive, and hard to clean up after.
