It was written about 170 years ago, so it'd make sense that the methods would no longer work now. Even if we count the inception of the Soviet Union as its first actual use, it was already pretty old to be relied upon as a manual.
The productivity gains I mentioned are a very important step in that direction. Capitalism and free markets work best on an economy saddled by scarcity, to the point many scarcities are engineered to extract labor from the scarcity gradients a bit like a Stirling engine extract mechanical work from a temperature gradient: you don't need an iPhone 12 (I know I don't) or a 64-core desktop (I could use one) and a lot of people will work so they can have the things they want, but not necessarily need. As the tangping prove, after you reach a certain level of abundance (a low one for them), capitalism ceases to be able to extract labor because the price of wanting more is too high for them.
These people who refuse to participate in this system are willing to live a materially constrained existence in exchange for more free time and a simpler life. I think we all could adopt a less radical position and still live with a little less and enjoy a life a little bit less complicated.