One subtle point that I explain in http://www.cawtech.demon.co.uk/lisp/ghost-benefits.html http://www.cawtech.demon.co.uk/lisp/ghost-benefits.html is that progr

One subtle point that I explain in http://www.cawtech.demon.co.uk/lisp/ghost-benefits.html http://www.cawtech.demon.co.uk/lisp/ghost-benefits.html is that programmers who write big programs that need serious planning can benefit from the presence of programming language features that they do not use. Grepping the source files to count the number of times that advanced features get used is only part of the picture.