I don't really agree with that unless you redefine the ego as being synonymous with 'being egotistical' or 'sinful pride'. You need a sense of self to feel pride and something more than base passion.

For practical purposes, if you don't acknowledge how good and bad behaviors can both spring from the same base emotions/thought processes then it's harder to grow out of the bad behaviors. You need to be able to reframe how the ego interacts with your work, not just try to kill it off.

Yes, and not thinking that one is better than anyone else. We are all equal, no matter how much better we are than another, with respect to either some job skill or even the spiritual path. Dunning-Kruger's true-experts are better than the slackers, but we must be humble to achieve that and then not be an ahole about our achievements.

It's a tricky business, being a human being, with its very many pitfalls.