If you want documented evidence that there is a nefarious cadre of organizations hacking phones en masse using high-profile exploits before you'll believe that out of date phones are something to give a shit about, then you'll never be "presented with an actual case."
What you're describing isn't the reason why we should care about security. If you don't care, whatever, but planning for bad things that could happen is just basic preparedness even outside of computing. If a fire started in my apartment and I didn't have a fire extinguisher I'd be fucked regardless of how likely I think a fire would be.