I think it’s debated a lot but from what I remember it’s because the sky is a big empty space, the Eagles are sentient and do what they want, the nazgul patrol the sky and dead kings sense the ring. Sauron has an eye that is ever watching. It would’ve been too dangerous and risky to lose the ring for the Eagles while the enemy still lived.
Typically they still have performance issues though? I haven’t played on consoles since Xbox 360, other than the odd Nintendo game. I spent thousands of dollars on 360 and PS3 games and hardware and have none of it now. But my entire PC library is still playable.