the best people for the job are not necessarily those that need no training. there are a lot of things to consider. part of that is that while new hires may need training, they also bring experience and knowledge to the team that others can benefit from. training doesn't only go one way.

you seem to prefer working on your own, neither willing to teach nor learn from others. that's fine if you can find a job as a lone developer, but i don't consider this a suitable attitude for working on a team.