Definitely an missed opportunity. Same with the Hemlock.
I actually think the Crimson Hunters should came with Holofields as standard, and that the Exarch should of came with another Exarch ability: This Exarch ignores the Snap Shot rule. That means he would be able to Jink enemy fire on a 4+ and return fire next round with full BS.
That's what I would of done if I was the designer. Also, if you look at the Hemlock, it should of really come with torrent weapons. The design is so off and irregular with the other Wraithscythes that it physically induces pain in my head.
No matter what, I will run one in my lists. Why? Because I love aircraft and these guys are the Top Gun of 40K (although their rules are a bit disappointing!).