I'm halfway through scrolling this long thread, and this is the first comment I've seen that isn't overly cynical. It's also correct.
I've been working for 38 years, and I've been someone who makes promotion decisions for 15 of them. The third one is helpful, not essential, but the others are super important. The people who rise to leadership positions aren't necessarily the top technical people, they're the ones who do those things with a good attitude.
The other thing I'd add is that they're people who are able to see the big picture and how the details relate to it, which is part of strategic thinking.
People have those things in spectrums, not all or nothing. You have to have at least some of all of them, but I'd argue that mediocre competency with really good communication and accountability is a better combination that really good competency with one of the others being mediocre.