But why should they have to do it by hand? We don't judge Excel and Librecalc by how easy it is to open their files and produce valid spreadsheets without good

But why should they have to do it by hand? We don't judge Excel and Librecalc by how easy it is to open their files and produce valid spreadsheets without good tooling. If they're working with structured data, why can't they use tools/editors which work with the structure, reveal it, and enforce it?