Training isn’t some magical way to transform an engineer with a skill set into one with a different skillset.

I don’t think it’d be possible to train the React dev in kernel programming unless they had a serious interest in low level stuff to start with.

That’s a ridiculous claim. Kernel programming isn’t some fantasy world where only the most passionate developers can do effective work. Most software engineers are web engineers because that’s where the market says they should focus. It says nothing about talent or ability to learn. smh.