Yep, ya gotta love a fantasy setting where all spells are submitted for review and approval by a regulating authority. I am soooo happy Mystra is dead. Five years ago I said "Die, Mystra, Die!" and someone heard me. I'm a PC and Windows 7 was my idea!Yeah, I've bin kinda reading into it, i guess the weave was more or less mystra's way of controlling the weave and limiting 10-12th level spells and making it so for instance certain spells could only get so powerful like flaming hands can only do 5D4max. (or is it burning hands...hmm)
Post-spellplague magic works according to a new set of principles. It isn't just a matter of installing a few non-weave-compatability plugins and suddenly you can cast some old previously forbidden 11th-level spell. More likely, those old spell books are of little use since they're designed based on infrastructure that's no longer extant.But here's where story/history and former editions don't make scenes. in 2e there was an eleventh spell called i think future weapon for instance where you could summon a Desert eagle .50mm and start capping Orc's. (laughs hard in side)
So yeah, with the exception that the weave is gone and anyone who actually knew the spell (like Elminster) would only need to adapt a bit to use it. As well as spell books in excess of 700+ years could give rise to evil unseen in a millenium.
Not sure why an 11th-level spell that summons a desert eagle is a big whoop anyway. In D&D, there are far mightier things than slugthrowers.