This is an incredibly important point.
It is arguably baked into the nature of policing that such institutions will over-reach their authority and attempt to consolidate it. Usually for all the right motivations, but they have systematic blinders to the unintended consequences and risks. For this reason, there must be effective counterbalances, and demonstrably court and board oversight is insufficient.
Hence it is important that for some actions that police are legally enabled to do, they remain too expensive (in time, manpower, money, whatever) to do habitually or without thought and prioritization.
Pretty much any technological advantage that facilitates parallel construction should probably be resisted for this reason.
With encryption, any solution I've seen suggested has the risk of mass use by the government in addition to allowing other people besides the government to use it.