I think there is a big gap between PM and developers , if given a specification sheet mentioning requirements "CLEARLY" and giving enough time for testing a dev

I think there is a big gap between PM and developers , if given a specification sheet mentioning requirements "CLEARLY" and giving enough time for testing a developer will deliver the product as specified . Also not forgetting that there are always very tight development cycles which come as people at management level over commit promises to clients not understanding the current team capabilities .