There is something that will cause PIO easily. On any FBW type, if the airplane tries to follow the stick command, and the stick goes too quick, it can cause some sort of PIO.
Try this on the A320 during flight control check. Full right, then full left and back to full right as quickly as possible.
The stick is quicker than the ailerons. So if the ailerons try to follow the same path (ie, up to full left then back), they will be lagging.
If the ailerons decide not to follow the same path but to follow the stick position at any given moment, they won't reach full left but will have almost no lag.