All Planets Are Earthlike: So very averted.  Actually, I think somewhat-terraformed Mars-like worlds are in a slight statistical majority among the Empire’s inhabited planets, but there’s plenty of other non-gas-giant like inhabited worlds as well, and that’s certainly not counting all the non-technically-inhabited ones.  (And even the relatively Earth-like — well, contextually, Eliera-like — ones have required some pantropic adaptations of their inhabitants for them to be truly comfortable there.)