Earlier quoted context omitted.
What you describe is true in any area, including software developers. You could just start learning about UX. It’ll make you a better engineer!
I think you're partly right that it is true in any area. But I don't think it's equally true in every area, and I think that UX lends itself a bit more to subjective artsyness than software development. But I generally agree with your sentiment; you can absolutely find "just trust me" in software development. You can also probably smell it out better by learning about it more.
You would think so, but the amount of 'developer superstition' and and 'gut feeling' I've faced in development is quite high.