Strange question, again related to ITF (I didn't get around to it this weekend) - do plumbots have different life stages, or are they on a fixed one, like Simbots?
(Which leads me to ask, which might have been asked previously, but I couldn't find it on my amazing 2 1/2 hours of sleep - if plumbots are on a fixed singular life stage like Simbots, why are Simbots required to leave the household, but plumbots aren't?)