Because they obviously didn't read perltoc (read my quote again) and the next time they want to know about a perl feature they'll come asking where to look instead of looking it up themselves in perltoc

Teaching users that perltoc exists is good. Substituting perltoc for perlref (or a particular section of it) is bad. Its like telling users "learn How to RTFM, the answer is in the docs". Its best to point out exactly where the answer lies.