I'm curious about this idea. I'm wondering why companies can't invest in employees and why the burden of everything is on the employee to come through the door

I'm curious about this idea. I'm wondering why companies can't invest in employees and why the burden of everything is on the employee to come through the door fully prepared and exactly what a company needs right out of the tin. Often, a previous novice had the role and gradually developed the role and themselves. Then, the company wants to hire some new person at the same salary as the person who left the role with all the developed skill of the previous person. I'm wondering why companies don't do a deal with employees : "we will help you develop skill for free at this job while you get paid, and in return you will work here in some capacity at x salary for x number of years to pay that off. if you leave early, you owe us money" Now, certainly, the employee could really stink and the company could want to fire them, but I think that would be an exception since the employee would have all the positive AND negative motivation to successfully fulfill their contract. This might help solve this pesky student debt problem we have as well.