Not everything you want to keep in a VCS is a "project": Sometimes you have one single file which does not belong to any other files, but you still want to have it version-controlled. Assume a TODO file, an Office document or something. How well do various version control systems perform here?
Preface:
$ uname -smr
Darwin 19.3.0 x86_64
$ sccs -V
sccs schily-SCCS version 5.09 2020/01/31 (x86_64-apple-macosx19.3.0)