Certain bugs have other special abilities as well. Some bugs are limited to walking. Pillbugs are the only other bomb-throwing bug, and they curl up into an invulnerable pill when bombed themselves. Good defenders, too. Cockroaches also have hard shells, and are invulnerable to poison.
Spiders can attack multiple enemies.
And so on. Other bugs can jump. There are also jumping spiders. Many bugs can fly. Bees have long range and a rather powerful sting, and are great bombers.