My wife and I love our DR. It has replaced our beloved 20-year-old TNF Tadpole as our preferred "couples tent". Others have tried; this is the only one to have succeeded, and that includes our BatRay II (a close second).
We did not find the DR to be too narrow for two adults and their gear (I'm 5'9"; she's 5'6"). We had plenty of side-to-side room, but then after 35 years together, we tend to enjoy sleeping very close to each other to begin with. We had more than enough room to sleep apart had we so desired.
More width adds more weight. Would we willingly spend 24-48 hours inside the DR during bad weather? Yes. Would we be comfortable? Yes. Would we be elated with the experience? Of course not! No lightweight backpacking shelter is really designed for long term comfort under such conditions (if you want that, buy TNF VE-25 and carry the weight), but it's a whole lot better than being out there walking through absolute crap. Been there; done that; learned my lesson the first time!
That said, I would have to agree that the maximum length of trekking poles does limit the shelter design. Personally, I would not have made this tent free-standing, although I understand why it was done. It works well for the Rainbow; less so for the DR. And yes, the trekking pole attachment straps can be a very minor annoyance. If you don't like them, cut them off. Just be sure you never want to take advantage of the free-standing functionality before you do.
While it is admittedly nice to have the ability to pitch it free-standing, we'd be ill-advised to do so in even the slightest breeze. We've watched too many Girl and Boy Scouts chase their free-standing dome tents across some field at Camporees when the weight of their gear (minus their bodies) was not sufficient to keep the wind from turning the unstaked tents into tumbleweeds. We'll ALWAYS stake our DR down. The added weight of 6 pegs is miniscule compared to the risk of having a sudden breeze toss the thing into the sharp branches of near-by vegetation just as a storm approaches. Also, we noticed that the lowest section of my trekking poles tended to bend slightly when fully extended and tensioned to support the DR. That can't be good for the poles in the long term.
The existing top vents worked fine for us, but then we weren't out in a rainstorm.
For those of you who might take the DR into known high wind environments, the added guy-outs along the arch pole could make sense, and Henry can add them if you desire. Even then, there are better tents out there which are designed for that sort of thing; you'd be well advised to give them serious consideration before pushing the limits of the DR design. I'm sure Henry would second that suggestion.
For the bulk of us, it's a non-issue. Personally, should I unexpectedly encounter high wind conditions either through pure chance or (more likely) through foolishly choosing a poor campsite, I'd take some TripTeaze and secure 1 or 2 loops under the velcro flap on each end of the cross-pole sleeve at the top of the tent, then secure the line(s) to peg(s) or rock(s) out in front of the vestibule on each side (a total of two or four added lines depending on wind strength). As Henry a stated in other threads, guying out the vestibules IN THE MANNER FOR WHICH THEY WERE DESIGNED gives plenty of wind stability. Trying to cross the vestibule flaps actually lessens that stability.
Bottom line - match your gear to the conditions expected and your level of expertise. Don't take a tarp to Everest or a VE-25 to the Mojave desert and expect everything to go off without a hitch. If you anticipate the need (or want) to push the design envelope for your gear, be sure you have the skill and experience to make the right choices when you modify the pitch or otherwise use it outside its designed limits in order to accommodate the conditions.
You'll see this statement in several of my posts on this and other forums: Don't let your ego write checks your body (and/or gear) can't cash!