I don't think you can really fault Larian because the fact is that depictions of halflings in official D&D art is so incredibly inconsistent, and every artist has had their own interpretation of what they should look like. Take even this thread for example. Some people want the halflings from 2e, some want 3e (I'm personally in the 2e barefoot Olive Ruskette camp). I don't think people can realistically expect them to be changed at this point, though even I concede that I'd like at the very least for their head size to come down a small amount.