Communication is great until someone becomes unreasonable and doesn't want to do something. Trust but the chain-of-command must verify. Shouldn't need to, but it should be there as insurance.
It sounds like a sentence about programs, not people. Consider people tend to make mistakes and being flexible in their intentions.
If all people were angels, no government (or whoever regulates) would be necessary.
If all people (and systems) were perfect, no backups would be needed.