Addendum to non-bolded comments:
It isn't necessary to enter all that stuff listed in the link you referenced. Open terminal, enter "diskutil cs revert disk1", then hit enter . Don't enter quotes marks obviously. I verified my disc is back to "normal"after two reboots to be sure, but MP6 still doesn't recognize the discs to encrypt. At least I'm back to OS Extended (Journaled).
This tip is not mine, it is also part of the comments to this link.
I hadn't noticed this file system change. A comment on the link you provided points out why Disc Warrior now has to go through the built-in recovery disc to work; it's non-bootable on its own because of this change. If Ars can't give a good reason why Apple did this, as technically proficient as they are, then the change was possibly trivial or even unnecessary.
Over the years I've given Symantec a hard time on this forum about never seeming to have timely revisions, particularly at major OS X updates. Symantec has claimed Apple was making last minute changes that made it impossible for a timely Symantec response, as was the case with 10.0 and now 10.1, and others in the past. Maybe Apple has a good reason known only to them for the change, but after this I'm at least inclined to cut Symantec some, maybe alot, of slack.
Wikipedia indicates that Core Storage is generally a good thing, and has been around since Lion, [hidden?] but if it's beneficial, it's over my pay grade, so to speak.
In any event, I think I'll try this also. Even if it blows up, with a good backup and no encryption, reverting to the backup would take maybe an hour, tops. Thanks!