Sure, it's true that "FWD cars will always have a potential for tighter turning radius." In practice, that's not the case for conventional front-engine layouts.
Most RWD cars mount their engines longitudinally, so the transmission sticks out the back of the engine. This means there isn't a whole lot of "stuff" sticking out to the left and right of the engine. That means more room for wheel articulation.
One problem with FWD is space. Since the engine is usually mounted transversely, the transmission has to go under/beside the engine, taking up space that would otherwise be usable for larger suspension components / wheel articulation.
The other problem with FWD is, as you mention, power transfer. It would be extremely difficult to design a shaft that could transfer power to a wheel that articulates up to 80 degrees. Keep in mind that such a shaft must snake its way through suspension components, too.
If I understand it properly, the demo is using torque-vectoring-by-brake during turns (basically braking the inside drive wheel). Most modern cars can do this, it's just not typically necessary for low-speed turns.
I suspect that the BMW i3 was featured in the video for a lot of reasons:
1) It's RWD, which leaves room for extreme wheel articulation.
2) It's electric, so there's less stuff up front in the first place.
3) The i3's tires are super skinny, meaning less resistance on those super tight turns.
4) The i3's short wheelbase means the outside rear wheel doesn't scrub too badly during tight turns.
Most RWD cars mount their engines longitudinally, so the transmission sticks out the back of the engine. This means there isn't a whole lot of "stuff" sticking out to the left and right of the engine. That means more room for wheel articulation.
One problem with FWD is space. Since the engine is usually mounted transversely, the transmission has to go under/beside the engine, taking up space that would otherwise be usable for larger suspension components / wheel articulation.
The other problem with FWD is, as you mention, power transfer. It would be extremely difficult to design a shaft that could transfer power to a wheel that articulates up to 80 degrees. Keep in mind that such a shaft must snake its way through suspension components, too.
If I understand it properly, the demo is using torque-vectoring-by-brake during turns (basically braking the inside drive wheel). Most modern cars can do this, it's just not typically necessary for low-speed turns.
I suspect that the BMW i3 was featured in the video for a lot of reasons:
1) It's RWD, which leaves room for extreme wheel articulation.
2) It's electric, so there's less stuff up front in the first place.
3) The i3's tires are super skinny, meaning less resistance on those super tight turns.
4) The i3's short wheelbase means the outside rear wheel doesn't scrub too badly during tight turns.