It is missing for "classical" builds such as mage, sorcerer and agent.

The other bound weapon spells are adequate to maintain classical builds considering class mechanics blending from Morrowind and Oblivion. (eg: Axe for battlemage, there was never really a blunt focused conjuration class so that is OK to be missing)

eg: Playing a classical mage or sorcerer, using a bound sword spell does not feel correct

You might argue that Witchhunter should get a bound blunt weapon because it is a primary conjurer with blunt secondary in Morrowind, but it is not quite the same situation as sorc / mage / agent. These classes don't have a primary weapon focus where a Witchhunter is primarily focused on archery, so again it is not as major a problem as bound dagger being missing.

Basic "classical" build concepts
Mage: Offensive spells and backup of bound dagger
Sorcerer: Summoning Spells and backup of bound dagger or bound bow
Agent: Stealth with backup of bound dagger

Thanks

I dont see why a mage would avoid a bound sword. No sane person would bring a dagger to a serious fight, if they expect some blade-to-blade action. With both weapons being weightless, the dagger loses its only advantage.

Oh, you were talking about classic classes. What is the big deal about that?