Suggestion: Add the voice of someone saying “Again?!” when it’s revealed to the Resistance that the First Order has yet another superweapon. I still like my idea that this is a weekly occurrence, and that’s why no one really cares when the system is wiped out. 😉
About the map, I don’t think it’s a map to Luke specifically. They say in the movie that Luke was looking for the first Jedi Temple. This is a map to the first temple that Luke found and erased the last step so people couldn’t find it. Heck, Obi-Wan and Yoda may have deleted that section of their maps while they were in the Jedi Archives so Palpatine wouldn’t just nuke it, Luke found the final piece, hid it on that flash drive, then went off to stay there.