Having both the M3 Cine and the M4 Pro, I have left the Expo settings "as is" from the factory, I change flight behaviors on the Controller (Cine, Normal and Sport), but eventually I will start messing with the expo settings.
Just got the drone, and man this thing is a beast. Much different flight characteristics than any drone I've had before, and coming from a Mini 5 pro - couldn't be more different.
Wondering where other pilots have their settings for each mode...
****UPDATE****
DJI are actually amazing.
They have issued a brand new replacement drone, free of charge.
Best company I have dealt with so far, honestly.