toy design is not always that easy. Alot of research goes into a single item. You can’t always get rational feedback from a 3yo. You also have the same concerns with marketing teams, engineering (this is more challenging than it seems as you have to design for the lowest common denominator and come up with ways that will still make it intresting), licensing and costing. Costing is really important. There have been lots of times were a couple pennies over cost has prevented an item from going to market.
Not to mention the super quick schedule. Typically we get about 6 months to design an item (from concept to tooling), realistically its alot shorter though.
In the end its still product and sometimes the perceived simpleness of the form does not relay entire process involved.