system
Given the following post, respond as if you're commenting on Reddit:
human
[Battletech]Why do we still keep centuries-old Battlemechs?

It's not like we lost the technical know-how to build new ones and that battlemechs are rare. Heck, even Periphery pirates can field Heavy battlemechs like no tomorrow. So why do the nobility treat Battlemechs as heirlooms and such?
gpt
In 3025, Battlemech production is extremely low. The Inner Sphere was just recovering from 250 years of extremely brutal war. The technology and industrial base was extremely battered. Most scientific knowledge has been lost. New Jumpships can't be built. Battlemech production is extremely low. House Davion's newest model is a mech with an axe. Some planets can barely maintain tractors let alone 'Mechs. 

The people that have maintained technology throughout the war are not sharing it with anyone, as it is their main advantage.