In the end, the HMD cables are wearing parts. After estimated 1000h with my Vive the cable was broken.
But it’s not so easy. Because on one hand a cable for this purpose should be as thin and flexible as possible. On the other hand the cable should be rigid and should have the lowest possible influence on the signal quality. They have to find a compromise, which obviously is not yet quite successful.
Also, keep in mind that pimax is actually the HMD with the highest resolution, and as a result, the largest amount of data must be transmitted via the cable. Of course, the matter also depends on other factors, such as the signal quality from the graphics card, or the cable length.