Boom blast does work with the post-Cthulhu Archangel RL1, and the weapon is quirky in that it does seem to have a very tiny blast radius where if a rocket hits between two body parts of an enemy then it can damage and shred both of them. For example, if you aim where the neck of an enemy would be, then the Archangel rocket will damage and shred the head and torso parts.
Yet if the Archangel RL1 is not supposed to have a blast radius stat, then the weapon would not need a blast stat at all and could just do normal damage instead. Another oddity is that in the 1.6 Cthulhu patch, the Thor AML mounted missile launcher has the same blast and shred ratings that the Archangel RL1 now has, but the Thor AML has a blast radius of 3.5 whereas the Archangel RL1 does not. The ‘Advanced Rocket Technology’ NJ research that unlocks the Archangel RL1 states that ‘a breakthrough in explosives technology has led to the development of a new rocket launcher design. It packs a huge punch, capable of taking down even the larger Pandoran creatures. The rockets are expensive to produce, but will be effective if deployed intelligently’.
The blast stat of 100 and shred stat of 20 reflects this description, but how the Archangel RL1 rockets could be filled with such an advanced and powerful explosive and yet have the blast radius of pop rockets is mystifying. Especially when the Thor AML is implied to use the same explosives tech that the Archangel RL1 uses.
The ‘Advanced Missile Technology’ NJ research that unlocks the Thor AML directly comes after the Advanced Rocket Technology research in the NJ tech tree.
The Advanced Missile technology research states that ‘A new infantry missile launcher system has been developed, capable of hitting targets with pinpoint accuracy with devastating destructive power. The missiles are expensive to produce, but they could be decisive in critical missions. The AI guidance tech may prove useful in further weapons development’.
The main difference between the Archangel RL1 and the Thor AML is that the Thor AML uses a more advanced and accurate guidance system, but the Archangel RL1 has an effective range of 999 whereas the Thor AML has an effective range of only 35. Seems more like it should be the other way around instead. The Archangel RL1 should have a blast radius of 3.5, same as the Thor AML, but the Thor AML should be the more accurate of the two launchers. Otherwise, the Archangel RL1 could be considered the most counter-intuitive weapon in the game, with the Destiny III coming in second.
Snapshot games managed to properly balance Kydoimos grenades and the Phoenix Shock lance in the new 1.6 Cthulhu patch, they can manage to properly balance the Archangel RL1 at long last.