Getting feedback from users based on their actual behavior is one of the most valuable parts of the design process. However, it is also a step that often gets skipped in many projects. Some teams that may be too confident about how people will use their product may rely on self-reported feedback or may perceive the testing process as too complex.
Despite requiring time to prepare, you need to make your teams understand that testing is actually a way to save time. Since the earlier problems are caught, it is easy to fix them.