Planned obsolescence is a direct consequence of capitalism, and it gets worse the more capitalism develops. Capitalism, through competition and markets, makes some companies triumph and some companies to be outcompeted by the ones that triumph. This, coupled with ever-increasing capital investment by the companies that get the most profits, leads unequivocally and necessarily to increasing concentration of capital in the hands of a few companies in a given sector: oligopoly and monopoly. And when a sector is dominated by oligopoly and monopoly, it means competition between companies, the whole premise of capitalism, disappears. And it is at that point when malpractice such as planned obsolescence becomes a thing, because consumers literally don’t have a choice.

You’re absolutely right that it would be great to go back to times before planned obsolescence, but the only possible way to do so is politically, by eliminating the very system that leads to planned obsolescence.