Oh, the irony!
Nesting things makes sense. Using a 1D notation to express nesting makes less sense. At about 6:21 he talks about the cause of switching from a more-sensible notation to a 1D notation. I suggest that ALL of our current programming languages suffer from this same kind of problem. Our programming languages are rooted in the phobias of the 1950's (and as far back as the 1600s, if one buys his argument). Our current hardware does not have the same limitations as hardware did in the 1950s. We CAN draw Vincula today, but we donβt. Instead, we continue to invent epicycles to work around having to draw Vincula and to avoid thinking more clearly about nesting. Oh, the irony.