Agency Voice - Brand Voice

Doing some reading...

I was researching for a broad definition of agency voice, as per usual I stumbled upon something sort of off-topic...

"Voice is being able to speak up and be heard, and to shape and share in discussions, discourse and decisions.

Agency is being able to make decisions about one’s own life and act upon them, to achieve desired outcomes free of violence, retribution or fear."

I started thinking, if we were to define Agency Voice as being able to speak up and be heard, in order to shape and share opinions that contribute to decisions for social impact. Whilst being able to make decisions and act upon them, in order to achieve desired outcomes for said social impact. Would that change the function and perspective of agencies?

- In this context, I am speaking about ad agencies, full communication agencies, marketing agencies, people who manage clients and their brands. They essentially represent these clients and brands to the public, the consumer, people. -

What does the agency voice mean to you? What does it mean to the industry, to the clients, and their consumers? The brands?