Manual-snip-subchapter

Why exactly does Manual-snip-subchapter default to t? It took me some time to find that `M-x man string(3tcl) RET' showing the string(3) man page was in fact a feature! The docstring says: *Should man look in chapter 3 for ctime(3c)? This is relevant for Solaris and, perhaps, other systems which have `man -s 3' not find things in chapter 3c, or other such sub-chapters Obviously, `man -s 3' not finding things in chapter 3c is not the only problem -- having foo(3c) and foo(3tcl) guarantees that `man -s 3' is the wrong thing to do. What I really don't understand is how this feature is ever useful. Why would I ever want Emacs to turn my explicit foo(3frobozz) into foo(3)? I would like this to default to f. Am I missing something?