In all products, there is a problem and a solution. The engineering is how you build the solution. The marketing is how you communicate it to the customers. If the product is well-done and a fit for the market, the customers are happy to hear the communication to know about the solution to their problem. That whole scenario is not opposition, it is multiple roles working towards solving a problem.
Now, people who are bad at one side or the other can make life difficult for the other group. And you do often see that. But flawed execution of the tasks is a problem with how they are done, not an inherent conflict between teams.