To weaponize lasers takes a lot more power than we can pack into a gun. They aren't very practical either, since making a laser that would only penetrate armor and the person wearing it without over penetrating into the people behind the person would be nearly impossible.
Plasma weaponry like in Halo is technically magnetic weaponry and would be much easier to control. Plasma is super-heated ionized gas, so it is affected by magnetic fields. It's why the plasma torpedoes on Covenant ships were so maneuverable, they would just change the magnetic field to direct it. It would take a lot of power, but considerably less than it would for lasers.
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You're an idiot. Plasma weapons are DEWs, not magnetic weapons.
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... Which are directed by what? Mostly magnetic fields. It's common knowledge that plasma is easily manipulated by magnetic fields. Ever heard of a plasma window? The point of my post was to answer OP's question of why most futuristic weapons are lasers and I replied saying that Halo's plasma weaponry is almost all magnetic based since magnetic fields are used to direct the plasma. It even outright says that plasma torpedoes got their maneuverability due to complex magnetic manipulation from the Covenant ships in one of the books.
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When OP talks about magnetic weapons he is referring to those which fire kinetic projectiles through the use of acceleration coils or rails. And to be frank, the plasma weapons which exist in halo are utterly unfeasible.
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I knew what he was talking about. Just in my mind, a weapon that relies on magnetic fields is a magnetic weapon, especially since there is no other way to describe the delivery system of Halo's plasma weapons. And of course Halo's weapons are unfeasible, that's why it's a Sci-Fi universe.
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Only the plasma weapons