Happy new year to you all, having just read that Steel188 didn't have any play it awoke my dormant and retired inner engineer and I started to wonder what the problem is if any. I had looked at four (including my own) PHEVs, all of which displayed some movement in the joystick, which is why I had written it off as normal.
The joystick head just pulls off with little force and is held in place with a retaining clip (which stays attached to the plastic head and shouldn't fly off)
I have no play at all from the metal shaft that is attached to the switchgear in the centre console, so all the movement is from the plastic head. I will take a better look later on when I'm fully awake (and full of caffeine) but my initial thoughts are threefold, the first being it could be wear or damage from normal use, the second is wear or damage from being removed and refitted or thirdly it is a plastic part that has poor tolerances from manufacture meaning that some will be tight like Steel188 has or a bit looser like mine.
I will take a proper look later and report back any findings.