Well, you are right about the non-fragmented tablespaces, but this is as much about the super-large disk spindles as it is about Oracle's SAME (Stripe and Mirror Everywhere) philosophy. With the smallest disks now running 144 gigabytes, shops with numerous small databases often choose to put them on the same devices using RAID 1+0.
However, I wholeheartedly agree. Whenever possible, it's always a good idea to put the data for different applications on different disks!
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