Thread:Cyrannian/@comment-33093990-20180307045510/@comment-1073312-20180313024627

Well here's the thing that bothered me, being humanoid doesn't necessarily make the creature crap or unimaginative, which you seemed to imply.

SporeWiki:Fiction Universe isn't like a centralised world building project. It emerges from the scaffolding of everyone's ideas, the connections in-between. For some reason, people favour humanoids unless they consciously try not to (and there's plenty of this). There's a guide here for people wanting inspiration for unusual morphology and biochemistry.

We do have an in-universe explanation. Life falls into two categories, "Godspawn" and "Truly Alien". Humanoid life is assumed to either follow convergent evolutionary strategies, or may have a deep ancestry based on panspermia theory and precursor interventions.