Because:
1. React components accept an OPTIONAL map of props as their first arguement.
2. If the first arg is not a map, it is considered a child.
3. Therefore, map destructuring the first arg won't work.
4. We can still use non-map props, e.g. `[component prop-1 prop-2 ...]`, but
   this isn't idea for components that want to accept children. Therefore,
   sticking to the optional-map-style props is consistent way to declare
   components.