That statement seems so broad that it can't possible be true in every circumstance. Always?
It is more of a general principle of keeping one’s emotions at bay to prevent your biases from clouding the data and your judgment.
I am sure there are evolutionary reasons for pride (i.e. ego) such as helping you fight with intensity for scarce resources or for maintaining tribal bonds. But in the modern world, it those circumstances are rarer and someone can use it against you pretty easily.
I think pride has all kinds of positive and negative features in the modern world. When I take pride in my work, I think about it more carefully and try and deliver a higher quality work. “Pride” and “Craftsmanship” seem very linked to me. That pride helps me deliver high quality work, which keeps clients around and earns referrals, which keeps me paid and food on the table.
When I don’t take pride in the work I do, the standards and quality can slip. I’m much happier if I can deliver work to a client that I can stand behind and be proud of. I think that’s in many ways an asset.
I certainly don’t disagree with you, though, that there are many scenarios where pride , hubris, and ego end up being problematic.
Initially, they take pride in being able to help someone, but eventually they’re giving much more than taking, and they cannot bring themselves to say no, whether it be to keep themselves happy because “if I’ve helped them before, why should I not help them now…even though I don’t really want to”, or to avoid confrontation.
Pride is always a liability, so I like to try to keep away from it as much as possible.