One big benefit of coaster bikes is that they’re entirely under the kid’s control. Your method works, but only with you attached. I’d rather empower kids to learn on their own.
Coaster bikes also teach kids to dab instinctively, which is a great skill.
I've mostly heard it in the context of technical mountain biking (where it's fairly common, but usually a sign of not quite getting through a section cleanly - you didn't actually fall off, but you couldn't keep your balance with your feet on the pedals).
Coaster bikes also teach kids to dab instinctively, which is a great skill.