I gather it’s like Twitter

Developmental scientists are partly responsible for this trend, with their efforts to discover how young children are capable of learning specific things. Those studies are really about the limits of the human mind, rather than what’s best for young children.

Katz said something like, Just because children can do something doesn’t mean that they should be doing it.

Lilian Katz had a great response to the trend to “push down” academic learning to younger children.

Another view

These are available to buy. Koga Denham bars. I couldn’t find them in US, so had to order from a bike shop in Netherlands