I spend ~0sec on these banners. How many are there people like me? The authors say nothing about this solution and it seems to me that they are not aware of the possibility of the automation. They just assume that each banner costs 5 seconds.
Why 5 seconds? It is an eternity, to pick "reject" and click on it would take 0.5 seconds or so, wouldn't it? Yeah, I know, there are sites that do not allow just reject all and force you to uncheck a several dozen of checkboxes one by one, but these sites eat much more time than 5 seconds, it is more like 50 seconds. Maybe 5 seconds is an average value across all sites? But how it was calculated?
But I agree, that the situation is stupid. It would be better to have a standard API common for all sites, that will allow addons to accept and reject cookies based on the user settings.