Huh but I wonder does old shield support modern hardware codecs like av1,vp9,h.265,dts-hd ? Software rendering of these would be slow or sound not possible at all

I recommend ugoos tv boxes (possible to install even manjaor) there a lot custom roms ,if more cheap options tanix android TV boxes

Yes and no,no because if u adding rating then someshow should be moderation of rating cause any random competitor app create a lot fake account and make fake downvotes to ur app and promote their own ,everything as in modern business done,so fdroid platform would need hire or put voluunter which would moderate it all and it heavy work