Oh it's because my 3ds is a bit screwed up and last time I'd updated it took me over 8 hours, I just don't want to have my 3ds Lying out for possibly 8+ hours updating w/ it's charger. It's just not worth it for me so I'm saving for for a new 3ds.
Yea, I'm hyped for Sun & moon too! I'm getting both copies but preferably Sun w/Litten ^^