Because you don't care about those people who would really benefit from an easy job for 1-2 years which gives them a foot in. Horrible values on display.
I do care for those people, but I subscribe to a different cultural model. To provide job training so that economy could function should be responsibility of the employer, or the government, and it should be considered a full time job. Regardless whether the "foot in the door" job is supposed to be a job training or not, then I think the employer is perfectly capable of paying minimum wage for people doing it.
Though possibly that could be fixed with proper regulation.
I disagree, I think it's a wrong path, because it devalues really deep expertise. It seems to me that people do not want to be experts anymore, precisely for this reason. Dabbling in many different things is seen as a path to success. But I think this culture is missing out on something.
By the way, good social security or basic income can be seen as insurance to switch jobs without too much risk, too.