Collaborating across different departments is actually much more demanding than expected. It taps into all sorts of cognitive resources—work styles, communication, technical skills, context, and more. If this continues for a long time, the people involved begin to feel drained. Those two team members I mentioned earlier both had a strong desire to grow and both wanted to leave—and, surprisingly, it was because they didn’t feel any personal growth. You could inject a bit of vision and make them push on for a while with inspiring words, but since they already feel let down by the company, sustainability is now very low.