I agree with that from the sheer point that I see very little reason to EVER swap out a WORKING 3sgte motor of ANY generation
And to go with that, buying a WORKING Gen3 motor just to tear it apart seems silly as well.
However, I would still stand by the fact that the 3sgte is proven to make quite a bit of power on the stock bottom end and "building" it is not necessary for ALMOST all owners.
From that standpoint, the risks involved with building/rebuilding are usually NOT worth it to the average owner and they are better off buying a WORKING, LOW-mileage motor to swap in.
Once that is considered, the number of people who SHOULD be planning to do internals is rather low... and thus for everyone else a Gen3 WOULD be a better platform. When you actually break down what you are paying for in a clip, the cost difference is worth the improvement for a better bolt-on platform.