The time it takes to initialize RAID 5 or 6, or to swap out a drive, was manageable when the drives were smaller. Now, the benefit of fewer drives is swamped by

The time it takes to initialize RAID 5 or 6, or to swap out a drive, was manageable when the drives were smaller. Now, the benefit of fewer drives is swamped by the extremely long time needed before you can do anything with them.