It cut even 1000 range Tachyon Lance to 600. Which mean it kill one of the bigger sale point of a beam weapon- Accurate long range strike.
A main saling point for support beams like graviton and ion, sure, but range isn't as crucial for burst beams.
If you are going in anyway, why don't you use Autopulse Laser or Plasma Cannon instead?
I know HSA make beam do hard flux, but at what cost? It is worth it? Can the OP better spend elsewhere?
Autopulse is very ineffective against armor, and more often than not, you will want to build-in expanded magazines if you are going to use it as a primary. Plasma Cannon is extremely flux-hungry, and you might be physically incapable of stacking enough dissapation to afford it in a given build.
How do you justify using High Scatter Amplifier over Advanced Optics, its greatest rival?
Advanced Optics can seamlessly improve PD alongside normal weapon, more range are always welcome, drawback easy to work with.
There is no rivarly, both hullmods are fundamentally different. Because all beams are softflux, they are very binary when it comes to overcoming shields. You either have a secondary hard flux weapon/can overcome their dissapation, or your beams straight up do nothing. HSA changes that.