One theory I've heard about the accelerating of the worsening conditions of western proletariat is that the USSR used to provide a bulwark against things getting too bad. People would point at the USSR and the illusion that capitalism was better for individual prosperity would collapse in comparison. Then, with the USSR gone things have been deteriorating for the past ~30 years.
If that is true, even somewhat, why haven't we seen a similar effect from China's example? Is the theory simply wrong? Maybe western capitalism is just unable to even offer scraps from the table at this point. Maybe people are unaware of how things are in China? Could we dare to expect that China's example will force a lifting of the boot from our necks?
Before we answer a question, we must first examine the premise of the question. Or in classic 知乎 (Zhihu, think Chinese Quora) phrasing: 先问是不是，再问为什么.
What are these "concessions from capitalists", where do they come from? Does the mere presence of a thriving socialist country pressure capitalists into improving working conditions, or is it actually worker movements that fight for better working conditions? Are capitalists threatened by the existence of protests and strikes, or of the reduced profits that result from them? Does Marxist theory or practice support the notion that "concessions from capitalists" can be gained without force or bloodshed? Are "benevolent" capitalists a traitor to their class or just making calculated decisions that ensure their survival and profits?
Let there be no illusion or metaphysical reasoning when it comes to capitalism.