It is a feature that is useful for many standard C library functions, a few functions in other commonly used libraries, and next to no functions in application

It is a feature that is useful for many standard C library functions, a few functions in other commonly used libraries, and next to no functions in application libraries in cases like the parent's OOo example. A reasonable approach to designing shared libraries would be to allow interposition as a non-default feature for explicitly marked symbols, and use fast direct binding by default.