I cant comment about most gameplay because i only played tutorial before and its always crash that i think the fact that they made save impossible there is horrible it self. Welp. Thanks, @Mr_Magika, changing AMD driver into 16.11.5 fix the problem. I am a bit reluctant to change driver because, it's prone to error. and Thanks for everyone else for replying my thread. The problem is now resolved. btw, how to change thread status to resolved?
"Saving" in Nier: Automata for Route A and B means that their data is uploaded to the bunker. With that kind of insurance, there would be less sense of urgency in defeating the boss. Besides, if they did allow save points before the boss fight, it would have invalidated 9S's sacrifice.