Because a Chadra-Fan can have a better Athletics pool than Coordination one.
Athletics check to reduce falling damage
:
2eA+2eF+2eD
1 threat, 2 Dark Side
If the Threat is not going to give me more Strain, I wish to use my 2 DS pips to gain 2 Successes. 1 Success, and 1 Advantage to negate that Threat otherwise.