To be fair, Rent-A-Girlfriend is such a low bar to clear.I never expected that a manga about a girl building models would have better character development than Rent-A-Girlfriend...
In model-building the end result it's also a major motivational point. Watching how you model/kit/unit/army ends up after all those hours assembling, converting, painting, decorating, etc.. is a wonderful feeling. But in the end it's mostly a matter of preference. There are those who only build (the minimum) and paint (badly) for their power in the tabletop game and those who spend months or years to have the collection they envision regardless of anything else.I think all time sink hobbies are all similar in regard to "Why do I do this? Oh, look it's the next day..."