If it is a marketing trend, it is not a very good one, all of the gear is bare bones basic, and does not break very much so no need to keep replacing it.
The companies that are run by the DIR folks, GUE, Halcyon, and EE are very close to the "walk your talk".
Halcyon makes the equipment.
EE sells it.
GUE is a research group that uses it.
WKPP is an org that uses it also.
Halcyon/EE could make a lot more money by making and selling all types of gear (stroke gear in their words) but they do not.
In my opinion top notch ideas, execution, and real life useage.
It is easy to get a lot of misconceptions on what dir is and means, this book is a good solid intro to the basics.
But like they say, it is always evolving and if they or someone else comes up with a better idea, they will use it without hesitation.
Tommy