In my experience, I only get a rather generic notification for software updates. When I click on it, I wind up in System Preferences, Software Update. And that

In my experience, I only get a rather generic notification for software updates. When I click on it, I wind up in System Preferences, Software Update. And that displays the Catalina update very prominently, then in a much smaller font, “Other updates are available” with a “More info” link. Only after I click the latter, do I learn about the security update for Mojave. After having been pestered about Catalina for quite some time, obviously my response is to close the window without looking further. If it weren't for the current discussion thread, I would still not know about this security update. This is why I called it hindering users. (Not sure how your final comment applies here.)