Earlier quoted context omitted.
And if you do become competent, you're soon promoted to another job you're not competent for.
This is why I turn down promotions. A promotion (especially to a management position) means another step toward the sort of work I don't enjoy and don't want to do.
I was told that all I needed to do was work one extra hour per day (in addition to normal support, elevation, etc). Why would I take a position with higher expectations for a 7% raise and a 13% increase in hours - a rate cut? Plus, if I'm a high performer in my current role I should be getting bigger bonuses.
I have a skip level where the department head asked what my career goals were. And my answer was to stay in my role. After all, I worked as a tech lead for a year and a senior dev the year after, with no talk of advancement until what I previously mentioned (which would be a rate cut).
My manager got me from my desk the next work day and you could tell he was pissed. He asked me why I would say that sort of stuff and said that was "stupid". I generally tell the truth and am pretty honest - I guess I'm stupid that way.
I heard through a friend thst they wanted to get rid of me for those comments and I managed to switch teams in time. My career has been in a downward spiral since.