Why do you consider it a hack? It seems less efficient than money in the end. Money is the cool hack.
Or rather it depends - for people like the woman in the article it is probably a good thing, because she excels at social interactions. If her world order would become the norm, the people less skilled in social interactions would lose out. So it is not fighting for a better world - it is just everybody fighting for a world order in which they have the best cards on their hands.
That said, if you open a PC repair service, the likelihood that the hairdresser in your neighborhood would come to you with PC problems seems high. If you don't offer repair services in your neighborhood right now, I wonder why not? My guess would be that your computer skills are probably more valuable than what you could earn with repair services (typically better paid than haircuts, so would you be willing to exchange 1:1?).
Yep, as an introvert, this is the part that would terrify me about adopting such a lifestyle.
Suppose I have chickens I sell at £5, outside forces reduce the value of that £5 such that chickens are now worth £10. If previously a haircut was £5, and is since I cashed up now £10 (inflated the same as the chicken did) then because I use money I've lost 50% of the value of my chicken; simply by using money. If I swapped that chicken for a future haircut then it wouldn't matter what inflation does or the charges banks put on transactions or how competitors try to low-ball the hairdresser out of existence. I get a haircut, they get a chicken.
Also, the equivalent to outside forces devaluating the money would simply be the hairdresser dieing or moving away - then he got your chicken for free, because you can not call in your future haircut anymore. At least with money, you can still go to another hairdresser.
It doesn't work that way. (Debate about the usefulness of taxes elsewhere please - the fact is atm the government wants our money/part of our production. It is not a result of the existence of money).
Also, you don't need to have a business if your exchanges are below a certain threshold, at least not in Germany. I am fairly certain it has to be similar in the US.