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Is RAID still needed?
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I'd say "old" RAID could be dead if you have proper backups and have the ability to replace a defect drive fast in the case uptime is crucial. But there's also modern RAID like btrfs and zfs that also can repair corrupted filed, caused by bitrot for example. Old RAID can't do that also hardware based RAID couldn't either when I used it until years ago. Maybe that changed but I don't see the point of hardware based RAID in most cases anymore
Hardware raid can 100% do any of the above tasks, and has always been able to do them. You need an actual raid card, not some half assed baked in mobo raid.
Hardware RAID was doing all of the above before software RAID was available to end users.
But AFAIK real RAID don't perform CRC, thy rely on drive to report bad sector. In case if on one drive data got corrupted, it would return data from one drive or another. In case of mirroring. If we aren't talking about RAID 6 I think.