This distinction wasn't a major concern when the former was impractical.
Because of digital records and search agents, suddenly either is practical.
The intent of privacy law has always been to raise the cost of targeted prosecution. E.g. "We want to charge this person with a crime, let's find a crime."
The state absolutely has a duty to prosecute and hold individuals accountable. And in extraordinary circumstances, may even need to target prosecution.
What is unacceptable in a free society is that the state should have the ability to target anyone for prosecution with no effective bounds in the number of simultaneous times it does so (aka everyone).
The difference between Orwell and a safe democracy is scale.
In this case, the state is expecting evidence to exist in the form of incriminating email communication between Smollett and his manager, and possibly additional people. From the public evidence so far, it sure seems like a reasonable expectation! I'm a pretty hardcore civil libertarian, and I'm having a hard time faulting the judge here.
What else do you expect?
The state has probable cause to believe there is evidence of criminal behavior in your <insert anything here>. Therefore the warrant gives them access to it in order to look for that (previously specified) criminal behavior. In this case everyone expects to find a smoking gun in his email - either talking to his manager or talking to someone else. That seems like probable cause to me.
Then why is the warrant not for _that_? Instead, we have a broad-reaching data pull that will be filled with a ton of information is irrelevant.
What if the Jussie and his manager were using codewords to disguise intent? A search algorithm would not be able to recognise that but a human being can easily infer meaning and intent from the context. What then?
There are no easy answers.