For RAID-5, the big issue is "lose a drive on a large-enough array and you could be looking at an unrecoverable read error during the array recovery".
This gets repeated a lot, but isn't a problem for any halfway decent RAID setup because they slowly read data from the drives in the background (called patrol read on LSI/Dell controllers). The chances of a problem with a drive not turning up in one of the numerous patrol reads yet happening during a recovery are astronomically small.
You can fool all the people all of the time if the advertising is right and the budget is big enough. -- Joseph E. Levine