Not developing NH more was incredibly dumb. There are like 3 NH scenes during war arc. A Naruto clone shows up to help Hinata, Hinata creams her pants from the feeling of Naruto's hand over her cousin's corpse, and Naruto irrationally tries to save Hinata from the IT. This is compared to Sakura meeting Naruto's father, Sakura pondering the selfless heroism of Naruto while wishing he would focus on himself, and the CPR scene. And of couse it was NS only before that. Why would you develop NS but do NH? It's literally the worst of both worlds.
Since Hinata to him is nothing like his wife he couldn't change her personality on a dime like SP does, he had to stick with Sakura. Because NS was for his wife as an apology that he was busy at working so he couldn't spend time with her, but he still loved her. That's the main reason he held on to Sakura for so long. It also why he doesn't like either SS or nH beside all the trouble it has caused to him. SS is his wife with another man, while nH is hated by his wife because it him being with a woman that she is absolutely nothing alike.