For a variety of reasons, I learned early in life that I couldn't really count on anyone, and I had to learn/do everything for myself. Not sure I'd choose that for someone else, but it has indeed been an extremely useful work skill. In pretty much every job I've ever had, I've ended up being the final go-to person for the hardest problems. Especially with respect to computers, there's essentially no problem I can't solve/mitigate/triage at this point in my career.

That said, this skill doesn't seem to be very useful for getting hired. Maybe I'm not marketing myself correctly. Once I'm in, though, I'm generally gold after a few months. Once had a manager burst into tears when I gave notice.

It does feel like this is rarer these days. In my current org of about 5000 people, I'm not aware of a single tech person on par with me in this respect. That might sound like a boast, but it's very much a lament.