You realize that even in the wildest fantasies of Xi Jinping's biggest fans, every single Western capitalist country is generations away from revolution? We can do left unity because 0.000% of communism or anarchism have been built, and the early stages of building either involve the same goals: getting workers to stand in solidarity with each other instead of fighting over petty trivial nonsense like "tankies" online. There is literally 0 harm that so called "authoritarians" pose to other leftists, in fact the same leftists who clutch their pearls over "tankies" tend to be the ones defending imperialism and the imposition of western economic hegemony on the imperial periphery (as long as they get healthcare!). What is more authoritarian and useful-idiot-esque than that?