I don't see this as being humble, I see this as a lack of confidence in their skills and abilities and achievements. These same people, for the same reasons, are adverse to avoid making decisions and second guess their work, which causes delays and communication problems.
Instead of trying to make this into an excuse of being humble, it should be acknowledged as a lack of a certain important trait.
Instead of trying to make this into an excuse of being humble, it should be acknowledged as a lack of a certain important trait.