I would bet that marketing departments for companies like Unilever have a hard time showing ROI on Facebook advertising. Why not get some marketing attention for cutting your spend?
I’d understand this argument for something like YouTube where most ads seem to be TV style and not trying to get me to click away to buy something immediately, but Facebook ads seem to always want me to go do something they can trivially track.
The ROI of that effect is typically real, noticeable and impossible to directly attribute.