Its large body is optimized for stacking and nothing else. It is too heavy to jump more than 1 and a half block, and it is too big to fit through 2 block gaps, making it easy to trap. Its low explosion power and slow speed makes it easy to kill. For humans, this will encourage more varied defenses such as building fences and more thoughtful pillar placements. For timebombs, it teaches new players to stack and strategize. It could also serve as a tank to protect smaller timebombs. See image...