ORIGINAL: CGRetired
One quick question for you.... how many hands do you really have? Really?

I realized a long time ago that I didn't have enough hands to fly a helicopter...
But, I can imagine where expo IS important for that because it doesn't take much in reaction to make a drastic change in the attitude of that helicopter. Overcorrecting can and will ruin your whole day!
CGr.
Hmmmmmmm ....... let me see ...... one ...... errrr ......... two - YEP, two hands, and no magical 3rd appendage!
To answer the point re expo being important on a heli, YES ... IMO, expo is critical on the heli as the reactions to input without it are mind numbingly fast, to the point where they can be dangerous!
I almost lost mine on the maiden flight due to not having enough programmed in (that old video is on my youtube channel under the same user name, I was TRYING to be careful when I nearly put the nose into the deck form a low 'hover')
I'll still use some on the plane as well (65" trainer with a .61 2 stroke in it), as I found some surfaces more responsive than others at the factory recommended throws, so will just add a little expo to sedate those surfaces as required, as that way, I'll have maximum throw available as and when needed, yet have them feeling 'just right' for normal flight.