Their filesystem goals are in some ways consistent with Apple's (marketing) vision: Users would never have terabyte libraries of anything, as the various iServices would (should) be hosting that stuff in the cloud (where one presumes it is stored on a filesystem that actually includes data integrity). Since users won't be storing much of anything locally, Apple needn't care too much about data integrity. This is of course, nonsense.
The idea that Apple's storage devices are error-free is arrogant--but even assuming that were true, there can still be bit errors in the SATA/PCI bus, errors in memory, race conditions, gamma rays, etc. Apple uses ECC memory on their Mac Pro, so obviously someone still believes that sort of thing is possible.