TT was Fred's pet project. All of the mechanics were developed by him and a small team of seven handpicked developers, and it was the only update he actively contributed to - in contrast, the other three updates were mostly just run by the respective developers assigned to them, with Pacifica being mostly uninvolved in their development.
The update getting scrapped and reworked because it wasn't good enough (according to OPAsian, current dev) pretty much erases everything Fred accomplished during his short tenure as the lead developer. It'd be tragic, if it wasn't so funny.