If you work client-side, you see what the agency presents. You do not see how the work was built, how the media was bought, or what the agency's commercial model actually looks like from the inside.
If you work in an agency, you see what the client asks for. You do not see their board conversations, their margin pressures, or whether the product and pricing are sound before you start promoting them.
If you work in a media network, you see the money move. You do not usually see whether it arrived where it was supposed to, or whether anyone checked.
The founder of Verso Insights has worked in all three.