The optimization argument is that even after throttling, if the software was optimized for the 6core machines it would no longer be slower than the i7 after one

The optimization argument is that even after throttling, if the software was optimized for the 6core machines it would no longer be slower than the i7 after one minute. But that's yet to be seen. As of this moment in time you're correct.. buying the i9 model makes zero sense.