You are right, but i can roll updates during the night without causing any issue.
Since after you finished playing you don't have a way to access your old games anymore
This isn't universally true.
I work on a telephony platform, some components of which need to be upgraded very carefully, because if you just restart the daemon without first transferring load elsewhere then you drop people's calls.
OK, there are less calls at night time, but there are calls all of the time and people don't expect their calls to randomly drop just because it's night time.