My main point is that while this is a promising decision, it is very far from the law of the land. And, as the original commenter pointed out, even if the 9th circuit upholds this ruling, the 9th circuit is only one circuit among many, and is often viewed as the most liberal circuit and not necessarily representative of the federal judiciary as a whole.
After the 9th Circuit makes their decision, it could still be appealed to the Supreme Court (which I think is the country’s overall direction the root commenter was referring to).
This kind of issue will come up very frequently in court because everyone has a phone, and it’s very easy for a lock screen to contain incriminating notifications. That kind of evidence is often decisive in court, which makes it an attractive/persuasive argument for appeals. Very likely this will end up in Supreme Court, which means decisions in lower courts are less consequential. The lower courts aren’t going to get to decide this one.