I'd always been of the opinion that ANY complete loss of air in the system can potentially damage the bags, and especially the strut seals.... I'm so convinced of this I paid a fellow to start my Mark every week for the last 11 months while I was away....
...and I'm an ex engineer from Ford on this model vehicle - but not a suspension guru.
Common sense - normal ride height for X number of years..... corrosion/dirt on strut shaft and shock shaft... bushings get hard, tie rod ends have seals, rack and pinion has seals and bushings etc etc etc.
It is not worth dropping the car for a photo and weakening an already challenging system.
Install sensor height adjusters etc to lower it for appearance (within reason)but don't deflate the system except in extreme emergencies, and if possible, don't let the vehicle weight rest on the bump stops but instead block the car off the ground at or near ordinary ride height.... if you want to treat the car properly.