If they need replacing less often, then presumably you’d be willing to spend more on them, so do I infer that they are sufficiently more expensive to wipe out the benefits of greater reliability?
So the reliability may be "worth more" to someone who pays a lot for remote-hands in a server farm somewhere, but not in this case.
I suspect when buying in bulk like BB does the difference becomes even larger ? Also they seem to build so as not to care of the reliability of any drive (as long as it stays within acceptable range), so a gain that may seem massive for us low scale user may not be of much impact to them compared to the cost benefit.