[Oh Edna, you did not]

They should care! The Meliodas era taught us many valuable lessons not the least of which that one can accomplish great feats with little resources! They built their entire civilization without relying on malakhim. Do you understand what that means? They had no access to artes at all! It was a slow, arduous development of their culture- to think that they could end up inventing things like Fodra tiles and Lambda cabinets... Isn't that inspiring?