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If is there a security problem with this lib you can download ONLY the security patch for this app that will replace her lib, not the whole app.
Fair suggestion. Still, you have to download it for each app you have installed. And you would have two types of packages - complete app, security update. If you can explain this to the users, why not "click these two buttons to receive all security updates". And if you can explain that to the users -- the same can be done today in e.g. synaptic.
the pc-bsd aproach is the best, without any doubts.
Care to explain? I don't want to flame on this? I'm honestly curious, why people are claiming this. I have not heard any arguments except of "people are used to this from windows". Which is an argument, but I'd be more interested in more technical ones.