MeiyoIsHONOR: so, then with hardware raid you're not getting any performance difference in your given case and you're tied to a proprietary on-disk format. if you dont have a compatible card in the future and that card dies, you're gone
there is simply no reason for it.
and you'd also want to ensure that you can manage the raid while the system's booted, which is given with software raid and very specific hardware raids
including failure notification and just everything