Filesystem mounting is run before RAID assembly service

Good day, folks.

After several reboots, I noticed that my mdraid volumes were not mounted automatically due to this:

root@OpenWrt:~# ls -l /etc/rc.d/S*
/etc/rc.d/S00sysfixtime -> ../init.d/sysfixtime
/etc/rc.d/S00urngd -> ../init.d/urngd
/etc/rc.d/S10boot -> ../init.d/boot
/etc/rc.d/S10system -> ../init.d/system
/etc/rc.d/S11fstab -> ../init.d/fstab
/etc/rc.d/S13mdadm -> ../init.d/mdadm
[...]

Why is it like this by default? Is there anything I should watch out for if I rename mdadm prefix to 10? I think it will run even before system and I do not fully understand the consequences yet.