Ext4 filesystem hits Android, no need to fear data loss (ars technica)

The biggest downside to baked-into-hardware FTL (which really means code-in-ROM for an embedded ARM7 or the like nine times out of ten) is that bugs in the translation layer can be subtle, hard to find, and difficult or impossible (depending on implementation, patchability, etc) to fix.

The upside is you get something that behaves like a block device, and you can use plain 'ol filesystems on with little or no special handling.