There is absolutely nothing for feral spec on tier one of the Balance tree which feral druids are 100% required to go down. While furor is 100% required for feral druids in tier one of the restoration tree with absolutely nothing that feral needs below it.
Feral is required to flat out throw away 5 talent points just to get what they are required to get.
Balance already have 5 talent points it is required to invest in in tier one to get to the lower tiers with "Improved Wrath".
Swapping Sylvan Blessing and Furor allows feral to actually not throw away talent points like that and doesn't hurt Balance or Restoration in the slightest as Sylvan Blessing doesn't virtually nothing for Feral but has use for both Caster specs who lose out on really nothing with the move.