[logicchains]

>Despite this, I still can't understand why they didn't think of starting geographical exploration and colonization

They literally had emperors who banned all overseas travel because it represented a threat to their own power: https://en.m.wikipedia.org/wiki/Haijin . China is the extremely large and extremely centralised, so the rulers' primary focus has always been on maintaining their own power. Fortunately the current government still allows private firms enough freedom that one was able to invent DeepSeek, however if the recent crackdown on financial firms had happened a few years earlier then the firm behind DeepSeek wouldn't have had the money to fund its creation.