The Forgotten Realms campaign setting includes an world-changing event called the Spellplague, which provided lore reasons for many of the mechanical changes introduced by Dungeons & Dragons 4e, such as wands with spell charges ceasing to work because they did not exist in that edition.

I have heard that Ed Greenwood (creator of Forgotten Realms) and R.A. Salvatore (author of many prominent Forgotten Realms books and creator of Drizzt Do'Urden) disliked this story development. What were their specific reasons for that?

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The Forgotten Realms campaign setting includes an world-changing event called the Spellplague, which provided lore reasons for many of the mechanical changes introduced by Dungeons & Dragons 4e. For instance, the Spellplague caused wands with spell charges to stop working, matching how they were not available to player characters in that edition.

I have heard that Ed Greenwood (creator of Forgotten Realms) and R.A. Salvatore (author of many prominent Forgotten Realms books and creator of Drizzt Do'Urden) disliked this story development. What were their specific reasons for that?

_{Inspired by a comment on this answer.}