That's because security patches are released that often. Microsoft is closed source they can get away with lying about vulnerabilities. Ubuntu works in the open and has no such luxury, every one knows exactly when things broke and when they were fix. Intentionally delaying the release of security updates would be a terrible practice bordering on intentionally malicious.
Just add a cron job to handle them without the silly and useless gui. I think there is also package for that, called apt-autoupdate or something like that. It's a MUST for every desktop.