[racket] #lang racket vs. racket/base

I just read Neil van Dyke's statement:

< "#lang racket" is for demos, IMHO; I *always* use "#lang racket/base" 
< for any code that's not a demo.

Question: What are the advantages of doing requires explicitly?

In a program of mine I changed #lang racket to #lang racket/base and
added:

(require racket/cmdline)
(require racket/string)
(require racket/format)
(require racket/port)
(require racket/path)
(require racket/list)


The resulting executable (created by raco exe...) had the same size.
Besides of transparency what are the advantages?

-- 
Manfred