There are two issues with this approach.

If managers just hire talented people, the talent people can just copy the process and then bring their (great) training material to the next company. Most managers hate to train their competition.

The second issue is what you raised in previous article. Manager lack soft skills. Teaching is a super hard soft skill. It is easier for people to tick a checklist than to be an artist to figure how bring the beauty out of new employees. I have lost count of how many managers who claim to be great teachers to find that they actually hate teaching or are bad teaching.