Sure there's some merits to including T-spins in a game, but the question isn't "Are T-spins good or bad?" but "Should T-Spins be a permanent feature of Tetris?" Permanent. As in not removable, non-negotiable, every single game, every single variant with wildly different philosophies. AFAIK even the guidelines doesn't force the inclusion of T-spins in a game. (Henk wasn't aware of its inclusion in TDS, implying the possibility of TDS lacking them; TGMA lacked them completely) Permanent inclusion sounds like a pretty strong statement to me.