From my understanding, Qin was essentially a war machine built up over several generations for the sole purpose of conquering the other 6 kingdoms. The basis for government, military structure, economy, social structure, was geared to this goal. But the problem after unification was completed is how to slow/stop this juggernaut, and whether it can be stopped before the system breaks.
In the mean time, while conquering the other kingdoms, the nobility were not all killed off, and many still harbored dreams of rebellion. Like 项羽, 张良, etc. So there's also a race between "digesting" the conquered lands, versus this powder keg that has the potential to explode as soon as there's signs of weakness (ie. 秦始皇's death). Unfortunately, Qin at that time doesn't have the tools for speeding up pacification and conversion unlike future dynasties which were built on 儒家.
But whatever means to "save" Qin, it's not gonna be through single-generation industrialization. And honestly, IMO, Han did such a good job through the collective efforts of half a dozen capable emperors, that I feel there really isn't any need to "save" Qin and erase Han. (Similarly, I am not fond of stories where they try to whitewash/save Sui and erase Tang.)
As for 汉武帝, from what I understand, it was originally a "轮台诏" which was essentially an announcement about changes in policy. There's nothing about regretting the rest of his reign about it. But later Song politician 司马光 turned it into a "罪己诏" as a means of critiquing contemporary stuff, and the new version spread to become pop knowledge.
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In the mean time, while conquering the other kingdoms, the nobility were not all killed off, and many still harbored dreams of rebellion. Like 项羽, 张良, etc. So there's also a race between "digesting" the conquered lands, versus this powder keg that has the potential to explode as soon as there's signs of weakness (ie. 秦始皇's death). Unfortunately, Qin at that time doesn't have the tools for speeding up pacification and conversion unlike future dynasties which were built on 儒家.
But whatever means to "save" Qin, it's not gonna be through single-generation industrialization. And honestly, IMO, Han did such a good job through the collective efforts of half a dozen capable emperors, that I feel there really isn't any need to "save" Qin and erase Han. (Similarly, I am not fond of stories where they try to whitewash/save Sui and erase Tang.)
As for 汉武帝, from what I understand, it was originally a "轮台诏" which was essentially an announcement about changes in policy. There's nothing about regretting the rest of his reign about it. But later Song politician 司马光 turned it into a "罪己诏" as a means of critiquing contemporary stuff, and the new version spread to become pop knowledge.
Original text & translation: https://zh.wikipedia.org/wiki/%E8%BD%AE%E5%8F%B0%E8%AF%8F
Analysis: https://www.163.com/dy/article/I24S7S940553MUXD.html