[BlargMcLarg]

That's the essence of the issue yes. Learning on the job is considered bad, but learning on the job is how most people learn. So really, we just fake it till we make it[0], and then we start doing what top comment mentions, actually knowing what we're doing.

This is then exaggerated by sayings such as "it takes half a year to get to full speed" in an attempt to either try and lowball learners, or as a defense mechanism as to why society should just cater to the whims of companies so they don't have to carry the risks. Despite the fact most people will be profitable very shortly after they get hired in a job remotely fitting them, if the company has any proper documentation on procedures.

[0]: And this is bad for the more anxious / modest / shy people. "Fake it till you make it" should be good advice, but it doesn't overcome massively inflated "must have but not actually must have" lists discouraging them on the spot, or the hundreds of mismatched job interviews and time wasted. I still don't know who benefits from the status quo aside from middlemen getting jobs that shouldn't realistically exist.