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I agree. The normal state of an iPhone is locked so it doesn't show any information about its owner. Once it touched by anyone other than the owner, it's the same as someone opening your front door and looking inside, with or without your permission. Police aren't allowed into your house without a warrant or your permission so the phone should be treated the same way. Glad a Judge finally stuck their next out and challenged the FBI.
Source : https://appleinsider.com/articles/20/05/22/judge-rules-that-viewing-an-iphone-lock-screen-qualifies-a-a-search