A post-victory Taiping Heavenly Kingdom would've still ultimately run the country the same way the Qing did, just with different people involved. Reform was arguable, in-so-far that reforms would've only been one to replace the Chinese Emperor with God/Jesus/Jesus's younger brother. Instead, the system of oppression, tributary economics (cefeng), imperial exams, Qing bureaucratic systems, etc, would've likely stayed in place, and I argue THAT is what has had long term negative consequences to the Chinese world view. The Communists simply adopted that system for their benefit, implying that a THK system that likewise adopted that system would've been just as rotten to the core... simply rotting away 60 years earlier. To be fair, sure, some things like the banning of footbinding and reformation of land ownership systems might have created a more positive environment in the THK than Qing China, but I'd argue that that simply addresses the symptoms of China's ultimate Bug People Society problems, not the cause of it.
Speaking personally... I don't know one way or another if my world would've been better if the THK won. Korea was a tributary state under the Qing, so MAYBE the THK might've convinced Koreans to fight back against them, but all that would've done was put is in the crosshairs of Japan's growing imperialist ambitions. Worse case scenario is that the THK would've eventually invaded Korea to stomp out its Neo-Confucianist state and replace it with a Christian one, which... I mean, some Koreans might have been OK with it, but Korea didn't really become Christianized as it is today until Japanese Occupation, which tied Christianity as a form of passive rebellion against the Shintoist Japanese. Christianity in Korea during THK's time would've been seen as undue foreign influence and would've likely fought back against any attempt by the THK to convert it.
In any case, I don't see Korea coming out of the THK winning any better... because even if the THK won over the Qing, the new THK gov't still would've had a weakened military as it fought to maintain control internally, though MAYBE they would've been able to consolidate power by the 1890s, but they still likely wouldn't have been able to protect Korea alone against Japan. I doubt history would've even changed the name of the "First Sino-Japanese War", with the only difference being that the THK's Christian-lead system might have encouraged more Western (ie Christian Nation) support for it's cause, but I doubt it would've been more than a token show of support for their Chinese-Christian bretheren.
Furthermore, because the THK would've almost certainly remained fighting amonst themselves (in this case sucession matters after Hong Xiuquan died, assuming he lived past 1864), I can almost guarantee that the THK wouldn't have prevented the rise of the Communist Party, which IRL took advantage of a fractured ROC gov't against an invading Japanese Imperial Army. Arguably the THK might not have been able to stop the ROC, because people power was antithetical to the THK's mandate from God. MAYBE if the THK got their shit together and was able to repel the Japanese from invading China in the 1930s, then MAYBE the THK would've also given the Commies very little opportunity to gain power and influence. But that's just speculation at this point. The alternative could've happened: traditionalist, pro-Qing Imperial factions might have risen up around the same time as the rise of the ROC and CCP, and instead of the Chinese Civil War being a two-way fight between the ROC and CCP, it would've been a four way war between governmental THK forces, pro-Qing Imperial factions (which had some 60 years to reconsolidate power behind a new Qing Emperor), a democratic-focused ROC and a revolutionary CCP. And God only knows how much worse that would've been... especially with the Japanese Imperial Army using that infighting as a way to take China out for good.
So yeah, I don't see a THK China be much different in 2025 than the current Commie China. I think their best timeline would've been one where the ROC remained in power over China after WW2, the KMT was less hardlined and paranoid, and the Communists were relegated as an official opposition party in the Yuan. Every other cirumstance spells Chinese Bug People Society no matter who won.
