Hacking scenes, as always, are ridiculously silly. He couldn't be writing code, so he was probably just figuring out and using whatever GM tools were installed in the console. GMs can usually spawn items and do stuff to people's accounts. If Yui is some kind of property that can be applied to an item (previously applied to her body) and then he gave the item to himself.... Still pretty ridiculous. The binary matrix stuff they showed and super fast typing, lol.

Yui was drawn to their happiness and joy, something nobody else in the game really has. After 2 years of fighting for their lives, are they really that insane to want to take a break and just enjoy each others' company and live life without being under stress for every second? Especially with their recent near-death experiences. I think it would be a lot more unbelievable if they just went back to clearing the game. Just because they're in a game doesn't mean they don't want to spend time with the person they love.

At least this series doesn't require as much suspension of disbelief as Accel World. The internet doesn't work that way. It has a lot less whining, too.

I don't think anyone would disagree that Yui's arc is the weakest by far.