You can. But landing isn't the only issue. You have lots of things you need to take into account. For example, at some point you need to be in the right positi

You can. But landing isn't the only issue. You have lots of things you need to take into account. For example, at some point you need to be in the right position for your communication and power needs. The payloads need to handle rolling around. Lots of reasons. Its a very invasive solution for one particular problem but doesn't help and makes other things harder. If you don't slow down, being round want help you when splatting on the ground. At the end of the day, we can make landing of the moon reliable with other methods that are less invasive and thus less costly. The solution you suggest is one that you use if you don't have any good options left.