As for the positive impact of complaining…there is none.

There are positive outcomes to constructive feedback, offering alternatives, and/or taking ownership of a potential new course of action.

I’m not saying that your life is happy, joyful, fun-filled all the time as we know this is not the case.  I am saying framing action addressing the less desirable components of your life and/or job, is an amazing step and opportunity to add more fun, joy and happy into it.