Of the people who have complained about the UI size, most have actually said it was too small (text size being the most common issue with the UI in this regard). Off hand, I don't recall any other complaints about the size of container windows.
I actually literally meant 'not designed to be'. If it had been planned from the start to be scalable (which it arguably should have been, IMO) it would have been easier to implement than going back after the fact and making significant changes. During the alpha Larian made a couple adjustments to the text size, and solicited feedback on that before finalizing it. At the time they said making the UI scalable was not feasible given the time and resources available and other features that had to be implemented.
Hopefully the game engine will be updated to support a scalable, possibly even moddable, UI. If so, it may be possible to eventually include that in an update to D:OS.
The question isn't whether something is possible, but where Larian devotes its limited resources to have the greatest effect.
