I was quite relieved that there is a mix of late game "best tech" that is not Plasma ☺based on the latest video release showing late game terror mission. Hopefully this isn't just deliberate setup by the dev.
I think it would be rather boring to have the best sniper rifle, assault rifle, shot gun & pistol always be derived from Plasma technology. That shouldn't be the case. Laser tech or kinetic tech should offer something that Plasma lack at different armament type. ☺Although on average the Alien tech should be best at most situation.
Maybe Plasma can be best at medium range damage. But Kinetic (bullet) adds knock back at the same range although less damaging. And Laser type weapon suffers no long rang penalty but alerts the enemy of the origin of the shot. Weight variation also can be applied to the tech type, where some hinders soldier movement. Different tech type weapons have varying affect to different aliens.