Sure, we all strive to improve. But the more you know, the easier life gets.
There are some major, A-level, artists touring with college friends of the band as engineer. Some of these guys are not super stars, and their concerts sound great. Granted, they have the support of an A-1, A-2, A-3. They know the band, the band's music, and that is what got them the gig. So, yes, there are some "super star" engineers, and some of them know how to mix, but they do not always get the gigs. They don't need to.
My point remains. It is not rocket science. It is an art as much as it is anything else, the more you do it, the better you are at it (hopefully) and if you find it hard to do it, then it is not right for you, or you need some more education/experience. That is the point. I am not saying that it is not demanding or sophisticated. It is. The most demanding for me were the HR and PR elements. I was a little too cut and dry, not PC enough, for those elements. Those are things I worked on. Iron sharpens iron, and I got a bunch of iron rubbing me the wrong way occasionally (usually by rookie bands and managers with no clue, no clout, no budget no patience and bouncing checks). But, the older I got, the more I learned what was important and relaxed a bit.