Now imagine if the in-game Halflings and Gnomes where "well proportioned" (child-like) and how media (narrow-minded reviewers and players) would react with that in combination with the "explicit romances".
I'm not sure where people are getting this idea that tiny adults would even remotely resemble children. Just take an adult body, with very clear adult features and proportions, and scale it down like it stepped into a shrink ray. If you think that's what children look like, you've never seen a child before.