Too fine design granularity leads to numerous macro/function/command existed in Emacs.

[Hongyi Zhao]

 It's well known that Emacs has already implemented numerous
macro/function/command in its current version. But it seems that this
is caused by, to a certain degree, the too fine granularity, i.e.,
there are many functionally similar macro/function/command are
designed separately, for example, `directory-files' and
`directory-files-recursively'. The traditional Unix tool, `find', can
do all the jobs of the above two functions by adjusting its
`-maxdepth' and `-mindepth' arguments.

So, I want to know why these macro/function/command in Emacs are
developed with such a fine granularity.

Regards, Hongyi