I think you are seeing this through the pink glasses.
You are comparing apples and peaches. Portal 2 might be first person, but it is still better played with mouse. FF is a completely different genre and irrelevant.
It’s not about fincancially feasable or if it’s by design, it has been so for decades. Once the consoles allow mouse/keyboard, controllers would become useless in Shooter games and would split the whole console+gamepad synergy. The same reason why we still drive with fuel instead of an energy cell, to keep the business running. I think you can use XIM4 to enable mouse/keyboard for some console games, but i don’t have a console, so i can’t say if it works straight away, or if the company who creates this device has to create support kits for each specific game.
Fact is that in FPS Games, like Evolve, mouse/keyboard allows for a much higher accuracy and if you put em together with gamepad warriors, the mouse wielder will always have the upper hand.
It just doesn’t work with Evolve and ends like i said with lots of frustration for the console players.