It’s easy to just write off kids' bikes as a toy. Chances are if you're reading this, that it’s been a while since you were running around a playground like a maniac at recess with plenty more energy to burn on the weekends.
As an adult, it’s pretty easy to grasp why better quality equipment makes for a better experience. For a bike that generally means fit, ride quality, efficiency, and weight. Those are all pretty straightforward to optimize. A frame that fits works better because you are more comfortable and better