In my opinion, it feels unnatural to transform such powerful units with impressive abilities into debuffers with very low damage. And to force-fit incorporeality (one of their main features)? Plus, the Knights simply don't have a separate animation for activated abilities, like the Herald branch, since the entire Herald branch consists of activators. Therefore, such a rearrangement leads to a reduction in animation variety.
I understand. But it's still a shame. I would have swapped anything for the Knights, even at the expense of balance. Even the Liches would have been a good choice. The Necropolis faction really needs more Knights.
I'm not against the current balance. Although it's still too early to judge, as much will depend on the hero-specific features and many other nuances that are currently missing. But in some factions, certain creatures simply feel out of place. It just doesn't feel right without them.