That's like saying "having 4 parity disks is dangerous, you'll lose all your data if 5 disks die!" They were supposed to run scrubs and replace disks when they

That's like saying "having 4 parity disks is dangerous, you'll lose all your data if 5 disks die!" They were supposed to run scrubs and replace disks when they die, not let it sit for 5 years.