Why? Because they were competent coders? That says nothing about their ability to manage people.
Because they had good people skills, understood the job, and were able to multitask.
And how often did these coders interact with the customers?
Mostly irrelevant. Not every manager has to interact with customers. But we did in fact have some interaction, and they were fine.
If you were designing something from scratch in a startup funded by venture capital, you probably had a lot of freedom to develop things without regard to customer demands.
Just the opposite. We were competing with an established player and had to win over their customers. We were very much in tune with that. You seem to think these are magical abilities you are talking about, but they are mundane.
If you think managers are overpaid and have it easy, then why not become one of them?
Because I have no interest, and it isn't something I would be good at. That doesn't mean it's an amazingly hard job that so few can do.
You say you have "no interest" in it, and that's fine, but why do you begrudge those who do?
I don't begrudge anybody that wants to be a manager. I begrudge the gross overpay and overinflated opinion of the job that they do. It only gets worse as you go up the chain.
I have seen many decent coders get extremely stressed out when working with customers, because the coders speak one language and the customers speak a totally different one.
That's fine, but again not every manager talks to customers, and some people don't find that as stressful as stereotypical coder would. You fill the role accordingly. Just don't pretend that the job is so special.
We come again to you are not interested in doing it
Yeah, so I'm not going to repeat myself.
you have a business idea but no capital, how do you acquire the capital? People look on CEOs with envy and ire, but honestly a "rockstar" CEO is no different from an entertainer or professional sports player. One of the jobs of CEOs, as the public face of the company, is to convince people with money to part with it.
Except that lots of startup companies have made it without rockstar CEOs, so your position is a myth.