My opinion: There's a considerable difference between imprecise plans and ones that have errors. If someone sells a product it should not be defective, and errors in callouts in plans are defects. The seller of the plans should go to great lengths to correct defects.
When a builder comes across a part/hole, etc with no listed dimension, then he at least knows he's got a mystery to solve. If there is a listed dimension, he should be able to trust it.
Now, nobody is perfect, so we have errata sheets. If an error has been identified to the seller of the plans and has been validated, that should be on the errata sheet, and ideally the changes should be made on the plane themselves if/when a new edition is issued.
Imprecise/incomplete: That's, to some degree, a judgement call.
When a builder comes across a part/hole, etc with no listed dimension, then he at least knows he's got a mystery to solve. If there is a listed dimension, he should be able to trust it.
Now, nobody is perfect, so we have errata sheets. If an error has been identified to the seller of the plans and has been validated, that should be on the errata sheet, and ideally the changes should be made on the plane themselves if/when a new edition is issued.
Imprecise/incomplete: That's, to some degree, a judgement call.