That's what I mean about too much content and missing content at the same time.To me, although I'd like to see an actual swordmage, there's already at least three subclasses that are different takes on the concept. The Eldritch Knight, the Bladesinger, the Hexblade/Pact of the Sword, and arguably the battlesmith artificer one or both of the Soulknight and Eldritch Trickster rogues.
5e has hordes of arcane gishes. Piles of them heaped on each other. And yet every single one of them fails to fill the niche in as unique and fun way as the 4e swordmage did.