That might work great if the federal authorities were reliable, motivated, and their interests were always aligned with state authorities. However, there are o

That might work great if the federal authorities were reliable, motivated, and their interests were always aligned with state authorities. However, there are often disputes where the feds do not what to prosecute certain groups or individuals, and might interfere with state / local authorities. (e.g. police in a Democrat-run state prosecuting allies of a Republican president and vise versa, or investigations into federal informants who are violating state law). This would also allow make it easier for the feds to perform on-path attacks where they "forward" EDRs from state / local authorities that were never issued by those state / local authorities.