Earlier quoted context omitted.
It's worse than that even... Historically, (before balance bikes) a lot of kids would progress from having training wheels all the way down, to two-wheeled dynamics. The problem is, having training wheels all-the-way-down means you have a tricycle, which doesn't have countersteering dynamics. So as soon as you pull the wheels up, they have to totally forget what they've learned.
Here in the Netherlands kids learn to ride a bike on little two wheeled wooden bikes, that they start to “glide” on. It’s a nice system that gets them right into learning how a real bike behaves.
I've heard people say that even when teaching adults to ride a bike, it's best to have them just push themselves by their feet (as you would on a balance bike) until they learn how the bike moves, then tell them to use the pedals whenever they feel ready.