It's a core feature of the engine, but that doesn't necessarily mean they have to use it.
Videos are more expensive in file size and rendering costs. Videos require special surfaces and systems in game which can decrease performance. Videos are overkill for what is essentially a tiny screen that nobody is going to spend their time looking at.
Once again, bare witness to Lord Tony believing like he's some kind of master of game design, when in reality he's just one of those pricks who shouts at PR guys about a game's framerate during events like they have any power to change the game.