Funnily enough my complaint isn't actually about elminster specifically, it's about people in that class of power and responsibility. Settings where PCs are swinging the biggest ***** magically and strategically exist, but like even in everron that's only true if you're not leaving khorvaire.
I've got a solid plan to destroy everything but it takes centuries to finish and even weeks just to advance noticeably. "Here's what can be done to stop it that only the PCs can do" is rough to work around. I might just Forge ahead assuming any DM that ran something like this would pretend epic npcs just don't exist I suppose.
Edit: I think I have an acceptable workaround.