We simplified the data preferences UI in Firefox 56, but there are still follow-up changes needed to make the Firefox internals behave as intended. See the details here: https://docs.google.com/document/d/12U_s9zHvpt7iGEMF5DazSzzx3whGbCnVWEsZTyclta0/
Why is it that changing this in the UI modifies: datareporting.healthreport.uploadEnabled but not: toolkit.telemetry.unified
This is because "toolkit.telemetry.unified" is an internal signifier of whether the Telemetry system is operating in Unified mode or not. This is a mostly-historical detail that will be retired as soon as our last non-unified Telemetry client (Fennec) is updated to no longer use this legacy mechanism.
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