The work developers do varies, so this question in general makes little sense. Sometimes, developers literally do R&D without knowing, whether they will be abl

The work developers do varies, so this question in general makes little sense. Sometimes, developers literally do R&D without knowing, whether they will be able to solve the task at hand at all. Other times, they use proven solutions for typical problems. I saw the most issues arises, when management starts to confuse between the two. From the business perspective, you definitely have to balance the ratio of the two.