Part of the reason I like spellstrike as a concept is because it cuts down on the amount of new mechanics required to make a dedicated Swordmage work. Having to come up with around 30 spells isn't too hard, but it is a lot of new content you have to make for a satisfying Swordmage. When you can just channel spells through the sword, you can get away with making fewer spells for the Swordmage. But, I understand to some that a spell list carries a lot of flavor, so maybe it's best if the Swordmage goes the route of making 30+ new spells regardless.