There’s different levels to stupidity as well, coming up with a “bad” idea, writing a very brief prototype of it, and presenting it to a senior for feedback is one level that is typically harmless. Coming up with a “bad” idea, going skunkworks on it and when you think you have something demoing it to many seniors and managers and showing them you’ve been working out of scope for a month on a bad side project that doesn’t work while the rest of the team is burdened in tasks is another much higher level