Two of them also overlap with one of my favorite PrCs and one of my favorite feats, as well: Swiftblade and Elusive Target. Persistent, Extraordinary Swift Haste...
Also, as shitty as Combat Casting is on it's own, it's also a pre-requisite for a lot of other, interesting stuff. Endurance is also a pre-requisite for Steadfast Determination, because honestly we're not going to invest a crapton in Wisdom for an Arcane caster.
So yeah, Spelldancer has a long list of pre-reqs, but you can easily use those pre-reqs for multiple, other really good things and get some really nice benefits out of the complete package.