We could switch between weapon sets in DA:O by using the radial menu on consoles... we could also access all of our learned spells or talents using the radial menu, so consoles are not to blame for either of these problems. It's just a bad design decision, nothing more.
OK, I'll concede that may be a functionality they could have offered, but didn't. I still believe the overall reason was limitations of a console interface design, not because of "bad design". It's pretty obvious a lot had been stripped out even in DA2- and the trend continued with DA:I- along with clunky mouse & keyboard controls, etc. Of course, we'll probably differ (and that's OK) on this. I own DA:O on Xbox 360 as well as PC, and I also own a 360 Controller for PC- I just happen to prefer keyboard/mouse over controllers, personally. I find controllers to be a little "simplistic" for my tastes, as well as ergonomically wasteful/inefficient (moving fingers further than they need to go, compared to WSAD, 1-0, etc.) but again- my opinion and taste.