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Before you go congratulating them on a great job, remember this is the second time they did this. The original attempt was called Robust File System. It was an abortion based on FAT16/32 with a duplicated file allocation table and some sort of journalling hacked on top.

It was claimed to be optimised for NAND devices and all that other good stuff, but the community quickly came to rename it Really loving Slow.

This file system was so slow that on the original Galaxy S the kernel would think software locked up while writing to the disk and prompt the user to force close the device. Search for "lagfix" if you're interested in what a disaster this was. There were users world wide trying to find fixes for the slow system performance, and the fix was often in the form of a kernel which supported ext4 or yaffs and a utility which converted the entire /system and /data partitions in the phone to the more common file systems.