Optimization Viewmode Shadercomplexity in Android ES3.1 preview questions

I have 2 questions regarding the Optimizaion Viewmode

  1. Is this the normal behaviour, that in ES3.1 Preview only the Shader Complexity viewmode is available and all other modes are missing from the dropdown?

  2. While in SM5, my shader complexity is green everywhere, also for foliage with lot of overdraw. When being in ES3.1 preview, this reveals the overdraw. Why does SM5 not show the issues in any of the available optimization viewmodes?