Why Bulma is useless in a nutshell.

    Doing one thing before a story begins doesn't make you important during the story.

    Doing one thing at the start of the story doesn't make you important for the entire story.

    Doing one thing at the very end of the story doesn't make you important for the entire story.    

    Doing a few things during the story doesn't make you important for the entire story, especially when the things you do are brief and only amount to lazy plot devices at most.

    Doing something off-screen doesn't make you important in a story, because if it's off-screen, it's not an actual point of focus.

    You're not getting any real focus or spotlight when the supposedly important things you do are brief or off-screen. 

    Being used for lazy plot devices doesn't make you important.  

    Constantly being used for perverted fan-service or misogynist gags doesn't make you important. 

    The plot in Dragon Ball is utter bullshit and only the fighting matters, because that's all that gets any focus and that's all people give a shit about. 

    Just made this in case you don't feel like reading the in-depth article.