My 3 month old Joplin 4 has play, around 2mm at the nose of the saddle.
I recently saw a 4 year old Joplin with a fraction more than this.
Dont sweat it, you dont notice it at all when riding, maybe if I had a choice as to what dropper post I could choose then I might have gone elsewhere but as the Joplin came standard I am not about to swap it out.
One last thing...
DROPPER SEAT POSTS RULE!!!
If any one out there has ever considered getting one DO IT!