I agree that the entire design of the plug-it cord has an inherent weakness to it. They should have made all the connectors stronger. But I bet Festool likes it like now, people keep on shelling out money for new cords and connectors, me included.
Some cords or sockets of my tools are broken after hardly a year. Others, like my RO150 are still good after 8 years. It's a bit of a lottery, but if you have more tools, some will certainly fail eventually. The rate is much too high compared to other brands