I think where I disagree is that there weren't more established guys in front of TH. I feel like TH could basically be put in any lineup (another reason why I though it would be easier for him to get time). It's not like there's a strict PF rotation where he must overtake Olynyk and Collins. For example, we started out with that 4 guard lineup that got smoked. We could have easily put TH in there. We actually needed exactly what TH provides more than another small guard who wants to dominate the ball. Furthermore, he was also behind Simone and Luka. Those are replacement level NBA guys imo. Simone is playing well, maybe elevated himself, but we were also talking about him getting preseason minutes for the sake of pity. So it's not like it's a crowded rotation or anything.
Maybe it was intelligent planning by Hardy/FO or maybe it was Hardy being a bad coach and not recognizing TH ability. It doesn't matter too much to me as long as TH is getting the opportunity.