I am having a hard time understanding what the Frostbite engine had to do with any of this. Anything you can point to besides your opinion on the matter?
Battlefield is a multiplayer first person shooter. It doesn't need a dialogue editor, save system, third person camera, a lot of systems that help support advanced AI, and many other things that the Bioware game would need. Hence Frostbite didn't have all these things. They needed to be developed from scratch DURING the production. Which means half of the team was unable to work properly due to the lack of tools.
ME:A and DA:I had dialogues a save system, third person camera, etc. Why were they disasters if they were very successful in their own right? I don't understand what you are trying to get at.
Seems to me the engine was perfectly capable of doing everything you wrote it can't do and both games were successful deliverables.
I am having a hard time understanding what the Frostbite engine had to do with any of this. Anything you can point to besides your opinion on the matter?