FWIW, at least in mathematics "obvious" doesn't mean "you're an idiot if you don't instantly understand this." It means, "this isn't deep. If you're thinking about really deep, complicated things beyond what we've been talking about, you're missing the point."

I have on multiple occasions sat down and worked with another mathematician on a problem for an hour+, only for us to find the solution and both conclude that the answer was "obvious."