In making this Very Bad decision, Gov Kemp stated that local govts cannot impose their own stricter measures.

Ceiling preemption is often an issue for public health law and has been used in the past by Georgia to stop local authorities protecting public health (labeling laws) https://twitter.com/jbellamytv/status/1252330778807209989

Beyond the direct public health risk of lifting these specific measures, there is also the message that this sends to the public. Understandably, they may begin to readjust their own behaviors in reliance on this, indirectly contributing to other transmission risks.