Originally Posted by
Marcus_Ti
The DM standard is very precise about where things goes, it also apples-apples shifts better. I've used it on the same frame with the same RD.
That's a worthwhile comparison if you're deciding how to set up a particular derailleur on a particular frame, but it doesn't really allow a direct comparison on the merits of the hanger standards. A "direct-mount" derailleur on a "direct-mount" hanger is no more direct than a traditional derailleur on a traditional hanger; instead, and ironically, so-called "direct-mount" could be said to open the door for indirect mounting when a "direct-mount" derailleur is used on a traditional hanger, which is what you're comparing to.
That said, the standardization of DM placement is an improvement, and the placement is probably better insofar as having a derailleur's upper knuckle start behind the rear axle sort of makes sense.