Yeah, but attached to that above you see in the pictures is the midsole, right, and then to this the outsole is stitched. As I mentioned above, the midsole is the key.
I see your point - the midsole essentially serves as a proxy for the insole. But as I said - once you cement on a rubber outsole and the original outsole is now a midsole - presto you have stitchdown!