There is a very interesting article in The Athletic about Luka Doncik's hamstring injury yesterday that will cost him the last 5 games of the regular season and most likely most, if not all, of the playoffs. He came out in the second quarter, was cleared to come back, and soon after came out for good with a 2nd degree sprain.
The article discusses 3 other NBA stars whose hamstring injuries cost them significant time on IR, ususally somewhere between several weeks to 2 months. All 3 had strains that were relatively minor so they tried to play after a couple of games, only to suffer 2nd degree tears and long times recovering.
This is what DP was trying to avoid. You can't just will yourself through hamstring sprains (the next step after cramping and tightness). The yammering seems to have died down mostly, but I still read comments by people here who think he really was just avoiding playing because of being soft.