I've noticed that some companies implicitly do this. Instead of hiring from the pool of people with the skill they need, they hire someone else with potential a

I've noticed that some companies implicitly do this. Instead of hiring from the pool of people with the skill they need, they hire someone else with potential and whom they like better. Then when it comes to the job, they don't tell you to learn specifically, but subconsciously they do know this and as a consequence rather judge on the quality of your work than "looking over your shoulder". Of course, it's also cheaper to hire younger people.