By far the majority of people problems I've had in my working life come from those who say "I am passionate about X - I don't know what I would do if I didn't have X".
True, people may not say the words but they live the reality.
In The Art of War Sun Tzu says that formlessness is strength. In "IF" Rudyard Kipling says
"If you can make one heap of all your winnings and risk it on one turn of pitch and toss,
- and lose, and start at your beginnings and never breathe a word about your loss" [you'll be a success].
Beware the "passionate" ones - they're afraid. They on;y have one thing that they think they're good at and they want to eliminate anyone else who wants to play in the same space they want to eliminate their risk - which is impossible. And that makes them desperate.
Beware the passionate / desperate ones.