I agree with this statement, but in this case the author lists concrete things he has difficulty with, like => and promises. I am responding based on my experi

I agree with this statement, but in this case the author lists concrete things he has difficulty with, like => and promises. I am responding based on my experience doing some react/redux work coming from a non-JS background, but the author says he is a designer so maybe that's where the difficulty is coming from. That's not to say there aren't hard parts, but those come farther down the line when you're trying to do something unconventional.