My observation, through the years, is that the highest-level leaders have a gift of challenging and stretching those they lead, and also blessing them with words of encouragement. Our words are more powerful than we know and regular challenges with no affirmation are not healthy.
I have worked with many broken staff teams who served under a strong leader, with good intentions, and the gift of exhortation. These leaders evaluate, critique, challenge, and sometimes dismantle, but sometimes they forget to bless and build up.
If you are in a role of leadership, commit to spend more time encouraging, blessing, and speaking words of affirmation. Make this a goal. Develop this skill. Get really good at it. Then, see how your staff flourishes and responds.