Most technologies have numerous levels. Researching a level typically improves all components tied to that tech. For instance, increasing Projectile Weapons improves all existing and future Depleted Uranium Cannons. Diminishing Returns vs. New Tiers:
Space Empires V (SEV), the technology tree is renowned for its immense breadth and depth, featuring thousands of tech levels that cover everything from ship components to empire-wide cultural achievements. Unlike more linear strategy games, SEV uses a system of prerequisites and incremental upgrades that allow for highly specialized playstyles. Core Structure and Mechanics space empires v tech tree