Your "life hack" is not a good advice. There's plenty of well-written explanations for why perimeter based security doesn't work. What is strange is that you've started in the right place: by being "constantly worried about security implications of each app". Unfortunately it's annoying and time consuming, but that's the right way to keep your data private. And if that's too much hassle, it means it's worth it to pay others to do it.
When I'm thinking about a hypothetical situation when I need to save the world by hacking into a hypothetical villain, my best hope will be him using your approach to security.
When I'm thinking about a hypothetical situation when I need to save the world by hacking into a hypothetical villain, my best hope will be him using your approach to security.