Yaffs and MTD

Hi,

I'm currently using yaffs on a new linux embedded device,  and I made my  
tests by simply implementing the write / read / erase / init methods, and  
setting it manualy in yaffs_internal_read_super.
My question is : What is the advantage of writing a new mtd driver for a  
yaffs filesystem? (I don't plan to use another flash filesystem, and don't  
plan to use already existing mtd drivers).

Regards,
André