— Peter Thiel
More board members may increase intransigence, decrease oversight (cover over who is really making the decisions and who is not), and turn US corps more bureaucratic.
Many totally rational worker ideals (keep comfy job) are often very opposed to a company's ideals (upgrade technology, take new risks, automate) that may disrupt current workers in favor of fewer workers or different workers. Boards beholden to current workers may sacrifice a lot of progress to keep things comfy, at the expense of future workers and jobs.
I get why, as this article describes, it happens in Germany and is suggested for the US. But on the face of it that mandating board composition is probably not the best way to help workers in companies. There is probably some better way that throws less sand into gears, that involves fewer attempts to mortgage the future of a company for its present workers, etc. Obviously it "works" in germany, for some amount of "works," but it should need no explanation that US companies as a whole are able to move faster, and in high tech, often with higher wages(!!) than in Germany.
Sorry that my perspective is dragging this in a tech centric, but everyone should ask themselves: Why are tech workers wages so low in Germany compared to the USA, if they have workers on the board? It seems unaddressed in this discussion so far, which I think is a great discussion to have. But lots of people so far are acting like its obvious that the German model will lead to higher worker salaries but its... not true already in Germany, for tech at least.