I think. Who cares what you make your sculpture from. That is off topic but... I see some really great ceramic sculpture.
As far as why.? Maybe we are just able to see it now. With social media it's way easier to see what's going on in the world. Instagram has pointed me to some amazing sculptors working in all sorts of cool stuff.
Huge ceramic sculpture
Wood and abstract for cheese
Maybe with the huge visibility available now it just doesn't matter what a person uses. Or it's just what they have to work with.
Any ways. Cheers