But even though the protection waned, it was still a factor of 6 better than the vaccine at the same point in time. It waned to be "only" 6 times better.

Clearly, you want natural immunity if you can get it safely, which is a big question. It still makes sense to get vaccinated for most adults. You can always get your natural immunity through a break-through infection, which you'll ride out more easily having been vaccinated.