I think Irving is what you see in the NFL with rookies. Dudes just don't know how to play injuries because they never had to before. I don't think Irving is worried about how he looks. He just doesn't know how to cope with pain and perform. This is a learned thing when you become a pro. You must be able to focus and block out the pain and then perform at a high level. On top of that Irving is injury prone and there is no other way to say it. So he needs to hurry up and learn how to play with pain.
I wouldn't go as far as to say injury prone. I think he hasn't prepared his body the way it needs to in order to sustain long seasons and heavy minutes. He admitted to it this season when he said he watched how LeBron prepares and said that he would need to do some tweaking this summer.
Tristan has spent ample time with LeBron every off-season since his rookie year.
Injuries happen to every single player some just prepare their mind + body better to deal with it.