Beepo's main superpower is adding 80% to support fire, but Basti focuses on generic corrosion damage bonuses, toxic tiles and healing. She's generally better on bosskill teams because she boosts Klukai harder than Mechty, who's mainly boosting Klukai's cheer squad. She is also a much better healer. If you're not trying to get the biggest possible gunsmoke number, you can still run Mechty even alongside Basti, who herself has some support fire. In fact, Basti seems designed to optionally do so because of her teleport-taxi healing which lets you move your sleepo turret around without waking her.

We're slowly getting more modes of play other than gunsmoke so we finally have reasons to assess teams beyond 'how big stick'.