I've also observed that there are generally two types of confidence: the brash, in-your-face type and the quiet, in-the-corner type. The point is not the type, the point is confidence. You need confidence in order to tackle problems, which might be wearing a mask of arrogance.
... but I'm not a psychologist, so take that with a heaping teaspoon of salt.
I've seen this borne out plenty of times. It can cause trouble when someone with this mindset doesn't realize that not everything is like software, and that 'moving fast and breaking things' in the wrong environment can waste lots of time and money.
Just because psychology or art are not defined in formulas that doesn't mean they're easy. Quite opposite: they're so diverse that it's impossible to formalize them into strict laws.
More diverse than the stars in the sky? It's a bit rich to suggest that psychology and art can't be formulated into strict laws. Pop music and advertising are some great examples.
As an example, I know practically nothing about psychology, having only taken a single intro semester of it at university. That said, from reading your post, I can already make the following claims:
You have a mass of 200kg ± 300kg. You have a temperature of 310K ± 3K. Your age is 60 years ± 55 years.
I'll let you pick any star in the sky. Can you tell me the mass, age, and temperature to the same accuracy?
We are all arrayed against the Dark Lord Entropy - humility and "measure twice, cut once" are nearly always in order.
And show your work.