Do you have any performance measurement on this?
Changing it on my disks will require me move all the data, format and move it back 
With fsck.ext4 you can use -D to optimize directories. It looks like when you create and then delete a lot of files (something that happens in Storj at the end) it helps to optimize inodes.
It feels like doing a du on all directories runs a bit faster, but not sure if it is real.