>How good are humans at teaching reading anyway?
Writing developed thousands of years BCE. So, considering we as a species have been successfully teaching our offspring how to read for hundreds of generations, I'd say we're probably pretty decent at it.
It's funny how people let cultural narratives get in the way of actual analysis. I think some of it is modern convenience has made us intolerant of any imperfection then they label even minor imperfections as a catastrophe.