This is a choice of the employer, to train , how to, or not at all, but for this employee who wants to learn, he will have to find it where he can.
Everyone has choices. And yes, "the boss" / "the employer" makes the choice in how training is conducted.
This Forum, IMO, talks about best practices (advice) on how to make things better where we work. In context here: The Employer makes the choice on how to train might be as much a Problem Statement as a Reasonable Explanation.
In the last place I worked we had a good training program running at one point, the most prominent factor being that Trainers were intentionally selected from experienced/more senior CNC operators who followed the Training Guide.
But the company ran into "management issues", and a bunch of leaders/managers were replaced with new people who, as it turned out, swaggered around looking for stuff to "prove" they were the best thing since sliced bread. Part of the fallout was that several procedures started to erode, and one of those was Training. "The Employer" decided to do things word of mouth and were assigning any ole Operator to train new hires, in some cases people who had only been working there days, or a couple of weeks". Needless to say the situation deteriorated to the point the Bigger Boss got involved and we corrected back to the original process as documented, and at the top of the list were:
1) Only Authorized (selected)Trainers are to Train.
2) The Training steps/processes for each position as documented were to be followed by Trainers.
Things cleaned up pretty quick, back to normal, after that.
If you are a tiny shop, well, you are stuck with whoever you have to train new hires. However, #2 above is worth considering: Whoever is going to Train should have at least some guideline as to how/what they are going to tell the new hire. Get that set now, evolve it to the point that is reasonable so that if you grow in size to the point you will assign selected people to train, #2 is already happening so you are just slotting in selected people. No real change.