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You're missing the point entirely. I never said to use a single disk, I explicitly compared it to RAID0.
As far as data security is concerned, JBOD/linear combination and RAID0 are the same, so you'd obviously use RAID0 if you didn't need redundancy.
No, JBOD is not the same as RAID0. With RAID0, you always need the disks in sync because reads need to alternate. With JBOD, as long as your reads are distributed, only one disk at a time needs to be active for a given read and you can benefit from simultaneous reads on different disks. RAID0 will probably give the biggest speedup in a single user scenario, whereas I'd expect JBOD to potentially outperform in a multiuser scenario assuming your OS and filesystem is tuned for it.
RAID0 is pretty much never the solution, and I'd much rather have JBOD than RAID0 in almost every scenario.
RAID1 gives you redundancy while preserving the ability for disks to independently seek, so on competent systems (e.g. Linux and BSD), you'll get a performance speedup over a single disk and get something that rivals RAID0 in practice. You wouldn't use it for performance because JBOD is probably just as fast in practice without the storage overhead penalty (again, assuming you properly distribute reads across disks), but you do get some performance benefits, which is nice.