It seems like twice a week or more I read there is an industry shortage of devs, but I never hear about any companies, of any size, looking for junior devs -- or generally competent devs that might have a specific knowledge gap -- to hire and give on-the-job training to. Not even a contract-to-hire situation that leaves the company with very little risk if the developer isn't what they needed.

Is on-the-job training just flat-out dead?

I ask this because I'm 4-years-experienced as a front-end UI/interaction dev, nothing but glowing references, looking for another, similar, position (regular, not senior or lead) and have had...way too many interviews and rejections, and can't understand why companies are such sticklers for interested devs to have Every Single Box in their list of requirements checked when it would take days or a couple weeks to learn XYZ framework/library/whatever to the level of competence that is required for the position.

To further stack up the frustration, it's not uncommon to see the same position listed and re-listed on LinkedIn and Indeed for months: certainly somebody could have been hired and trained to the level needed in that time. (Maybe even me!)