I believe the point that OP is making is that the encrypted data on our phones is data historically would never have been available to law enforcement, as it si

I believe the point that OP is making is that the encrypted data on our phones is data historically would never have been available to law enforcement, as it simply wouldn't have existed. Then as now law enforcement can investigate but the investigative process is impossible to automate. On the other hand giving the government access to all the data that we now store about ourselves would enable automated forms of law enforcement that, in the past, were just not possible (this is what we're seeing in China).