I have personally found that adding storage volumes can be quite dangerous, depending on the environment.
For example, when using "hardware RAID", externallly attached framestores and other utilizations.
I had machines configured for 4 disk striping and when I installed SEPM, it blocked the "storage volume" which made the machine unbootable in anything but safe mode. I had to uninstall SEP from there.
The same thing with Fiber attached and Ethernet attached external framestores (storage volumes). Was quite a pain.