Monorails typically use rubber wheels, which DO have a lot of advantages (maximum grade, sound, stopping distance), but I'm also unclear why that couldn't be ap

Monorails typically use rubber wheels, which DO have a lot of advantages (maximum grade, sound, stopping distance), but I'm also unclear why that couldn't be applied to birails. Monorails might also have a smaller turn radius? Ultimately I feel like the problem with monorail is that public transit is primarily a political, not technological, phenomena, and so while there might be a good idea in monorails, or iterations where it could be combined with birails to make something truly technologically superior, but it just doesn't matter.