If you don't let them do this from time to time they will quit eventually, IME as a manager. Whether that's beneficial to the org or not is debatable. You can

If you don't let them do this from time to time they will quit eventually, IME as a manager. Whether that's beneficial to the org or not is debatable. You can kind of "release the pressure" in a planned manner via hackathons, but those almost always never have the appropriate frequency.