However, there's a middle ground. Rather than stop the RAID creation process, a WARNING dialog could be popped up much like the box for deleting a shared folder. Something to the effect;
Using RAID on (certain) SBC's is not supported and comes with the risk of data loss. Continue?
Much like "delete" warnings, the above is fair notice before performing an operation that's known to be risky. This would be a service to unsuspecting users, while allowing hobbyists to do as they please.
I still think this is a good idea (Even a post just about arm and raspberry pi) from the prospective that I can point people to this information from YouTube.