I mean, the loot wall is kind of a thing. So to even complete the loot wall 'New Game Plus' is a pre-requisite.
I'm not disappointed that the 'Loot Wall' cant be completed without prior knowledge of each of the weapons, but for completionists like me it's important to find these weapons and store them for the feel of 100% completion. Satori is only available in one part of a story mission and once that story is over, well too bad. I actually broke into the building and got Satori after the fact, but was unable to leap from the impossible height of the roof and live. So I started the game over.
Another option would be to have a menu for 'legendary weapon' tracking. Then, during a mission, the 'tracking' would indicate somehow that the legendary item is available (or not) based on a notification.
And yet another option would be to allow the playing of a mission over-again at any point during the story (like a braindance), with the possibility of only looting items that are 'of legendary status' and no XP allowed.
In any case the idea of New Game Plus is for sure useful (in this sense) to me. -w