As Swen himself has said Larian would publish the officlal mod toolkit, don't you think modders will not discover even more of Larian's lazy coding, bugs and missing content than they already have? Larian is no Bethesda, but promoting mods is bread and butter to the longevity of this game, and perhaps entices the developers to think harder when they publish the NEXT iteration of BG3 (eg. Definitive Edition), or any RPGs they make in the future.
Think of it how you will, but my opinion is the modding is about taking back control, giving and rewarding players with choices that they, than petioning developers who want to preserve their artistic vision and narrative and force players down a narrower path.
Sorry for rambling. On the specific topic of Minthara, really after reading
that IGN article I don't hold out any further hope.