I'm new to Prevayler: Query vs direct access

Do you recommend using "Query" as a replacement for any and all direct
access to a prevayling object?

Does doing so de-necessitate any and all concurrency control?

If I have no concurrency control of my own, are there any cases where it'd
be ok to use direct access to a prevayling object instead of Query? If so,
what are they?

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