You want writes to flash to be as sequential as possible. Random writes to flash result in more wear and worse performance due to GC overhead. Log-structured f

You want writes to flash to be as sequential as possible. Random writes to flash result in more wear and worse performance due to GC overhead. Log-structured file systems tend to write data sequentially since the writes append to the log (yes - that's a gross over simplification). File systems like ext4 maintain separate data structures for data and metadata and generate more random writes.