Presumably to crank out multiple features at the same time. After spending some time writing project rules for Cursor I've gotten it to reliably implement end-to-end CRUD operations from a simple description of the fields and functionality. It's pretty neat and surprisingly accurate but it does take time to generate on the order of ~1k LOC so I understand the desire for parallelization. If you have a well-factored codebase with loose coupling, good abstractions, etc. this should be pretty doable without them stepping on each other.