This does depend on what the engineers are being employed to do..

Are they there to be communication and documentation experts, or are they there to turn requirements into something that works?

I agree that there is benefits in having engineers who can engage with their managers, advocate for required changes and influence the management to act in a more beneficial way, but at some point the person doing this stops being an engineer and starts being a manager themself.

Managers are there to manage, that is organise, coordinate and ensure that their staff are completing tasks in the most efficient way possible. That will at time require them to communicate with both their superiors and their engineer staff. That requires them to be the the communication and documentation expert, not the engineer.