It's shocking to me. Every employee you hire is going to have to be trained on SOMETHING that is new to them or specific to your company. Why dont companies spend more time developing onboarding and training programs that actually work?
Separately, in larger companies, there will be significant variance between the onboarding process of teams/orgs.
It's true that a recruiter might not know about a companies training program and that program may exist and actually be good. But its much more likely they wont know because one either doesnt exist or isnt formalized at all and isnt a focus for the company.
This happens to me irrespective of whether I went through the painful learning curve just recently or several years in the past. Once I am comfortable with a topic, I cannot approach it from a newcomers perspective.
So I think having a systematic approach to KT and training will help.
A friend recently told me the story of a very predictable train wreck at his company... management knew he had the background to do a good job with the training, but that wasn't the priority I guess.
End result estimated to be ~3 person years wasted because of a lack of good training/process onboarding/mentoring. The newcomers weren't incompetent, but they needed more than they got.
That is probably the best that I've seen.
Also at a smaller company something like:
"The first week all new hires go through insert specific industry training so you have a good understanding of the lingo and terminology we use here. This will also help you understand our business better and how your work impacts that. After that you will be paired with a mentor, separate from your actual manager, who can help answer any questions as the get up and running."
Even if all of that is nonsense and a waste of time it shows that a company cares and is trying and thinking about onboarding and training. Most companies are not, or at least are not in any formalized way.