I feel that part of it could be the lack of cohesiveness as a unit? I had a quick look through the various line ups we've had since the start of last years 6N and we've tried quite a few different combinations between then and now - mostly due to injury. Navidi is only a few weeks back from injury too, and this was Moriarty's first game since the 15th of December which probably hasn't helped either.
I'd like to see Young given a start vs Italy however, mostly because he's been overlooked for years and deserves a chance to stake a claim to one of the backrow spots.
On an unrelated note - not sure if anyone has really discussed this, but can't help but feel that Parkes deserves a lot more credit for helping create North's 1st try!
Obviously Huget's howler grabs the headlines, but Parkes' kick is nigh on perfect, especially in those conditions. He spots the space, sends it through with enough weight to hold up short of the try line.
Huget then has to try and play the ball as North is chasing hard behind him - ball is soaked from splashing towards the try line leading a very high chance of a mistake, and even if Huget holds onto it he takes it over the try line which almost certainly wins Wales a 5m scrum and a brilliant opportunity for a try anyway.
Fantastic bit of play in my mind!