Do NOT abandon your new employee once they come onboard! Humans want to perform competently, they want to feel capable. Too often they are hired, given one quick training and then thrown to the wind with a quick “Let me know if you need anything!” said in such a manager that makes it clear that you better not ask for anything!
Humans need support and training. And often need to be trained on something multiple times! Now if you’re having to retrain the same thing, and ALL the things, over and over five or six times, you may need to rethink keeping that person onboard. But giving someone a once-through and then walking away is a surefire way to set the employee up to fail!
None of us want to feel incompetent. We get a release of hormones like Serotonin and Oxytocin when we are able to complete a task effortlessly and start to fall in love with our job and become much less likely to take off!