Part of the unknown is likely what temperatures, how much radiation, of what kinds. The SLIM lander can land in places previous automatic landing systems couldn

Part of the unknown is likely what temperatures, how much radiation, of what kinds. The SLIM lander can land in places previous automatic landing systems couldn't, so it's very possible this area has never had such measurements done. There's still much we don't know about the moon, including how cold the lunar night actually is in different areas. Also, the point of SLIM was to test the new automatic landing system, a combination of camera-based navigation and a new landing strut system meant to handle inclines. 100 meter precision instead of previous 20 km. Everything that comes after that is near-free extra data.