It´s also an easy way to explain why magic changed, continents appear, Abeir and Toril are separated again, gods revived and why fighters cannot feint anymore...
A God Did It
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After the Spellplague business I think they tried to go back on track and restore (wipe out) most of the changes that 4e made and retake a more classic stance in D&D. They even called the Cataclismic event (tm) of this times "The Second Sundering" to evoke ties with the old first Sundering of AO and the time of troubles and the FR setting become more alike the one of versions previous to 4e.