Kain Darkwind said:
But then this brings up the question, does 'use' matter? Would you advocate that same concept be applied to gods? Should greater gods have a CR of, oh say, 24, and then have a method where you can 'scale them up' to keep them at least a level higher than the party cleric? What about high level NPCs like Larloch or Elminster? Should he be CR 20 or below because he is 'no use' to the bulk of DnD games?
Books have finiate page-counts. Everything that goes in means that something else needs to be cut. That being the case, I think 'use' is a very important issue.
I'm not suggesting Elminster should be scaled down, the Great Wyrms should be CR 25, or that the Greater Gods should be no higher than CR 28 (which is about the limit that can be challenged by a skilled and lucky 20th level party).
What I am saying is that if these creatures are so powerful they cannot be challenged, the stats are of no use to me, so should be omitted. Just give me Elminster's class levels and CR, and I'll work up stats if I ever need them. Then, use that half-page for something else.
The stat-block for each of the gods in Deities & Demigods is more than a page in length. The same is true of the stat blocks in Faiths & Pantheons. That's an awful lot of wasted paper. (And even if I did find myself needing deity stats, it's highly unlikely that I'll ever need the stats for more than one deity, so even if I use the book, it's still a miniscule fraction of the page-count.)
Great Wyrm Dragons aren't useful to games of sub-20th level, AS ADVERSARIES.
Unless the creature is going to be used in combat, I don't need stats, only a rough idea of what it's capable of. And if the combat does not involve the PCs, then I still don't need stats - I'll just narrate the battle between the Great Wyrm gold dragon and those six Balors, and get back to the focus of my game - what the PCs are doing.
Now, there are some cases where the PCs might be fighting alongside the Great Wyrm Gold Dragon against an army of Balors. In which case it's true that I probably do need stats. But it's such a rare occurrance that I think the space taken up by the GWGD's stats is still better used for other things - I'll just scale up a weaker dragon if and when the time comes.
You shouldn't be basing the use of a creature though (much less a unique NPC) based on how many people's parties can roll initiative and walk away the victors.
Great Wrym Dragons should be at the CR they are at. They ARE that powerful. If that means that you can't use them in your games as a combat, that's ok. They don't need to be a combat. Not all creatures in the game exist only to convert into XP for the PCs.
But if it's not used in combat, why do you need stats? Especially for something like a Great Wyrm Gold Dragon, which should probably only exist as unique creatures anyway, so a set of stats can be considered one example at best.