Backplanes are tricky and costly and in this case you need a custom one with sufficient power delivery. If you making a custom case for a fire-and-forget (and

Backplanes are tricky and costly and in this case you need a custom one with sufficient power delivery. If you making a custom case for a fire-and-forget (and very rare HDD replacement, and in Netflix case - probably redundant on the node level) operation it makes sense to use breakout instead backplane.