My take: include a schema when you can and there's a justification and it's practical. IMO even JSON is a (very limited, "name only, no type") type of schema. I

My take: include a schema when you can and there's a justification and it's practical. IMO even JSON is a (very limited, "name only, no type") type of schema. If it becomes impractical for something you're doing, stop and switch to something less redundant.