> Anything outside of learning enough to do your job should be at the business's expense.

There's no "should" here — it's an open market with a lot of agents. You're free to pursue certain working conditions and then look for employer that will agree with them. And another developer is also free to go an extra mile and ask something extra in return.

This is why I'm against any kind of unionizing for developers, by the way — too many different situations and opinions about what our working conditions should be.