Most games update on wednesdays or thursdays , they want to get the servers maintained before the busy weekend . If they did it on a mnoday that would mean the servers were not maintaied all week and would be more likely to go down during the busiest time , on friday night and on the weekend .
even if they did it on a monday that's just the online daily toirnament that is not happening on that day , thre is still online multiplayer and thousands of users online on mondays .
They can't keep everone happy and no matter what day they do maintenance someone is inconvenienced but at least it's short and during the night when fewere people will be online , you have all day to play online if you want to so just play your tournament or whatever in the morning or afternoon before the maintenace period .Consider this , while you may be uncable to play late in the day in other time zones its in mid afternoon or morning so even if they did the maintenace at 3am your time someone else is in aaaaanother time zone where it may be 9pm or noon , all they can do it try to make it as inconvenient as possible for the most users .
Be glad they do maintain it regularly , a lot of games do none or very litte maintenace and go down a lot , hot shots is pretty good and only goes down if psn goes down and you can't sign in .
A goal is not always meant to be reached , it often serves simply as something to aim at