There's certainly some truth in this. When I was in grad school, another grad student made a sort of questionnaire for undergrads who were considering going to grad school (and I later made it into a flowchart). It was a bunch of things like "are you willing to spend 5-7 years being paid starvation wages" and "are you willing to move anywhere in the country or possibly the world to take whatever job you're offered", and any "no" answer led to "consider a different path". It's harsh but likely true.

There are a couple caveats though. One is that the chance to make these kinds of choices is a privilege. I don't think most people working as supermarket checkers or delivery drivers are there because they had a desire to do it and then unpacked it and decided yeah, this is the job for me. A lot of people don't get to choose jobs because they want to do them.

On the flip side, a lot of people have jobs that they didn't choose with too much deliberation --- but still like their job. And that's partly because when you unpack many jobs, you get something like "would you like to hang around with a few pretty good people while you all do X?" Not that those people are part of the job per se, but if you wind up in an environment where your co-workers are reasonably fun to be with, and/or the customers are friendly, and the job itself isn't super demanding, it winds up being okay.