Some do, they are curious, and I can teach them a lot. At this very moment I have a junior engineer in my team. He is eager to learn and we do a lot of peer programming which benefits us both (having to explain why choosing some solution is even harder than making it 'by intuition'.

But the ones who don't are more difficult for me. I think some might be shy or unaware things can go better. The most trouble I have is with the really stuborn who don't want to learn, and think they know it all.

I try to avoid these engineers as much as possible, by hiring the ones I think are eager and willing to learn.