Agreed. We didn't get onto the balance bike tip until my older kid was a little older, but my younger one started on their older sibling's balance bike as more-or-less a toddler and was riding a bike with pedals by age 4. With basically zero frustration.

Watching peers of theirs who used training wheels, I've realized they're a trap. The mechanics of how a bike actually steers are completely different when you put training wheels on it. Whenever a third wheel is touching the ground (something that seems to be hard to avoid while turning, from what I've seen) it starts to steer like a trike instead of a bicycle. So transitioning from that to riding without training wheels is doubly difficult, because you also have to un-learn the instincts and muscle memory you developed with training wheels.

Transitioning from a balance bike to one with pedals is much easier because the main instinct they'll be taking from it - putting a foot on the ground when you get into trouble - remains useful. It naturally helps prevent skinned knees during the transition period.