deprecated tech in weapons lists

[ThinkSome]

Why is there no "hide obsolete tech" in the weapons tree? I don't know what e.g. light cannon is doing there cluttering 5 pages of weapons 50 minutes into a medium-oil team game.

[Berserk Cyborg]

There is such functionality and it is enabled by default. When opening the manufacture, build, or design menu there is a small black icon at the top which shows or hides obsoleted stuff. What gets redacted is specified in later research items having the redComponents key for components or the redStructures key for structures.

In the case of the light-cannon, no other research has specified when to obsolete it.