Well yeah IMO they just didn't want to devote resources into building a completely different interface for PC SP.
With that said, DA:O had a COMPLETELY custom PC UI, and DA:2 at least took advantage of some of the perks of playing on PC (i.e. a FULL spell and abilities bar, and FULL hotkey remapping support). DA:I is simply showing the continuation of the trend: the game is published by EA, and EA only cares about $$$$$$$$$$$$$$$$$$$$$$$$ (they were still voted "worst company in America" again last year, and have held that sh*t-staighned throne for quite a few years now).
The simple fact is that misinformation about PC gaming being "so expensive!" (which was untrue before, and LAUGHABLY untrue now, with their consoles prices shooting up with each new "generation") means that most of their sales come from consoles. SInce they are aware of this, they will no longer put any extra effort into fully utilizing a PC port's capabilities (a low priority profit margin), and focus their game building on where their $$$ IV is feeding them from - the consoles.
Also, EA was the ONLY major game company to not post losses last year. Why? Because their corner cutting tactics are actually working - they release half-baked games by cutting corners and thus by cutting design costs...
I mean, cmon guys, we've known for years now that AAA gaming's new slogan is:
"Consoles first, then maybe PC later if there's time, idk, no promises, don't hold your breath".
Nothing made this more apparent than Microsoft's "exclusivity clause" with Bethesda so that the X-ded gets the DLC's first. They paid the devs money essentially to start a big boys club that you are not invited to. And Bethesda's attitude wasn't even limited to its PC customers. The PS3 was left buggy, broken, and DLC-less until they had finished with Skyrim and made their "Legendary Edition", that the PS3 owners could go buy for all the DLC's they were supposed to already have been able to get, plus the bugs left in the game because, you guessed it - cost cutting measures, pushing a buggy product out untested because they didn't care and it wouldn't hurt their sales.
I could build a gaming PC equivalent or even better than a console's capabilities for the cost of this gen's console, and it would have more uses than just playing games! YOu could even learn to make your OWN games on it (as I have done)!.
This would of course require assembling the computer yourself from parts you bargain hunted for, so the ONLY pull consoles still have over PC is "comes rearin' to go", which is also starting to ring untrue. With the absurd "fwocwus onz hazing tehz pweeeteest gwafficz en awllz dez lwandz", cost cutting on the expensive parts needed to keep up with the demands for "pertier gwaffics", means that a console no longer had a guarantee of technical stability for the games made for it, and this is true of all consoles in the current generation.
Of course, this absurd focus on graphics has another side effect: it's f*cking expensive and time consuming! So even more corners get cut to have the games out as quickly as possible (while the current gen console is still "relevant"), and they end up at launch with a library consisting of maybe 5-10 games (at best).
This is the point where PC laughs in their face, as there is pretty much 100% "backwards compatibility" on PC. I mean, just the other day I decided I wanted to play Warcraft II again, a game that dates back to the early 90's. Now try and name one console manufacturer that can play it's games from the 90's? Sony? Not since the PS2. Microsoft? Didn't exist in the console race, cuz they were focusing on *cough* PC GAMING (which is just too damn funny). Nintendo? They sure held out the longest at least for their handhelds, but you can't play Gameboy Pocket games on any system past the Gameboy Advanced SP, and their consoles were the worst of the three (since they were not discs but cartriges, but this was not possible to port, so it's not really fair to them). But PC? Still playing all my childhood nostalgia, and even a whole bunch of the games for their consoles as well (cuz emulators rule)
*In case someone decides that I need to be banhammered for admitting to playing ROM's, I would like to point out that I only use ROMs for games that I own or have previously owned. I have very little respect for EA/Bioware at this point, though, so if you decide to ban me I will just *shrug* and go elsewhere.