You know the current procotol that setu app uses is way more battery consuming than apple-google's bluetooth only approach.

I wonder how those poor old phones will survive with it.

(I don't wish to engage more because I don't think you are looking for a good faith argument here because android app released by the government won't work on those Nokias and I don't see why you can't have two different appS with different level of efficiency because you will need two different apps regardless?)