Have you ever played X-COM TFTD? Can you remember Disruptor Pulse Launcher? the http://ufopedia.csignal.org/usopedia/Disruptor%20Pulse%20Launcher.html
THAT Weapon was OP! Stay in your Triton, open door, shoot a self-guiding (you set the points) rocket that smashes nearly everything in an extremly high aoe.
Maybe they should balance it a bit, yes.
You know X-COM 2 and the micro missles from the mech? Many small aoe rockets with a small amount of damage.
The higher the distance they fly the more random they will hit, this way the accurancy for mounted weapons would make sense, just like projectile weapons.
Phoenix Point could make a version with rockets that could fly above obstacle and as you say a version with rockets flying straight forward.
Btw, we haven’t seen any weapon yet and let’s see what Synodrion and Disciples of Anu have.