Can't say that different namespaces are a sign of Lisp showing its age. At least in my mental model, it is convenient to know that a single symbol can name seve

Can't say that different namespaces are a sign of Lisp showing its age. At least in my mental model, it is convenient to know that a single symbol can name several different things in different namespaces at the same time - e.g. a variable, a function, a type, and a few more that are possibly defined by the user. Enforcing the "strictly one meaning per symbol" paradigm seems pretty self-defeating to me, since even in a Lisp-1 users can - and eventually will - create their own namespaces, implementing a Lisp-N themselves.