A great example of the point being completly missed.
When I want to make time over open water, I apply power strokes, staying on one side or the other while paddling in a straight line, bow never wavering by more than a couple of degrees from my destination. I do not waddle like a duck with bow swinging pointing left and right away from the destination with every stroke..
I don't think I missed the point, I think my words didn't maybe convey what I was trying to say, as well as I would like. "Dancing around a dock" ... the intent was to say, when I need finesse and close quarter control, I reach for the single blade ... realize now that it could be construed as negative and that was not the intent.
As far as "waddling like a duck" and the bow going to and fro .... the DB is just another tool in the box IMO, if the hammer keeps hitting your thumb, maybe it isn't the tool for you. I personally don't waddle and haven't observed anyone with that issue in our group, we have a trip planned soon, I will try and remember to do a poll with them, see if anyone has that, as an issue.
Lots of folks use the DB, lots of folks don't use the DB ... I have a good selection/types of straight blades and bent shafts ... can't say I am totally proficient with any of them, I know enough to pick what is likely needed on any given trip and make them do what I need. The key for me, is to try the paddle type ... learn what it offers and if I can make use of it, in my tripping. Some times I like it, some times I want to change it a bit and some times I just don't like it. The nice thing about this approach is that I am always looking at new stuff and always adding to that toolbox.
Something to keep in mind, is that we don't all travel the same waters/terrain, use the same equipment, have the same trip frequency and aren't all the same age. What you pick to trip with will be impacted by all of the above, as much as we would like a "universal" paddle or the "ultimate" canoe or maybe that antigravity backpack, they just don't exist. We generally have to settle for what we find is best for the individual and as long as it gets me out there, I guess I can be content with that.