You know nothing Jon Danwson.
More seriously, I interviewed harada 3 times about TxSF and it's not a basic 2D game he's working on, more something that blends 3D mechanics with 2D mechanics and need a lot of work. For example when I asked him last year, he was working on offensive jumps and it was hard as it's not common to start attacking by a jump in a 3D game, but it's mandatory in 2D games. He was also struggling with the responsive feeling you have in a 2D game compared to a 3D game, trying to find the right balance.
Harada cannot change Tekken too much and said he wanted to use TxSF to try new things he could not do in Tekken.