The basic design of Mørch arms goes back to 1970s. UP-4 was a very light unipivot, designed to match then-fashionable ultra high compliance cartridges. Replaceable wands allowed exact mass matching without compromising rigidity.
As the high compliance/low tracking force fashion faded, Mørch responded with "double-pivot" DP-6 and so-called "precision" armtubes that feature an integral headshell. You can read about its ingenious bearing system, combining best features of the unipivot and knife edge, at their website
Right from UP-4, Mr Mørch has correctly identified geometry as an overlooked obstacle to reproduction quality. High compliance cartridges were especially prone to "scrubbing"
(anyone remembers the "Grado wobble?"), and putting the stylus and the pivot on the same plane eliminated its vertical component.