Task management is like losing weight. Everyone knows the real answer is a little self-discipline, but nobody likes to hear that so they keep buying the latest new app hoping that THIS one will be the silver bullet. The fact that none of them really work any better than a simple to-do list is what makes them addicting. The rush of trying the new thing, followed by the let-down. It's just like drug addiction.

Do they need a different one? Probably not.

Could they benefit from one? Quite possibly. Small amounts of personalization can make people a lot more efficient — even if the actual difference is primarily mental, that still matters as long as your customers have minds.

(Whether that is the case here, I can't say. But I've seen how much a very slightly customized solution can resonate with people.)

(copying my answer from above) - We run marketing campaigns and we spoke to others who had similar problems. Most PM/ Task tools are generic. We are betting on the fact that there are certain functions that are specific to marketing teams and people running these kind of features e.g. workflows to run a campaign, editorial calendar, integration with social networks etc...we'll see how it goes...:)

Today we have a lot of generalist tools for dashboarding, task management... I think the next step is to customize those tools for all domains/sectors (marketing, finance / production, service) in order to deliver the most plug&play/expert products.

No, but they probably think they do, so there's money to be made there.