Everything about Paul Romer's plan (https://roadmap.paulromer.net/ https://roadmap.paulromer.net/) makes sense and seems uncontroversial except Step 5: Let ever

Everything about Paul Romer's plan (https://roadmap.paulromer.net/ https://roadmap.paulromer.net/) makes sense and seems uncontroversial except Step 5: Let everybody get tested and if you get a negative result, you don't have to wear a mask. This permission not to wear a mask is also mentioned in the New Yorker article. But I don't see any justification given for the no-mask part. I can see how it would be an incentive, but I'm not sure it wouldn't just erode the norm of wearing masks until everyone felt they could get away without wearing one.