Perl got where it is via evolution
*. Evolution begets cruft. It strikes me as particularly ivory-tower-minded of people to wring their hands over these little throwbacks, particularly considering that Perl was
never intended to be elegant. I trust you know where to find Ruby.
It's not like this thing is something that's constantly tripping people up and making Perl painful to use. It's more of a wart that adds some amusing character. Yes, it's a flaw. What is there to do about it? Break backward-compatibility? That would be a worse flaw. And that's why evolution begets cruft.
*You were thinking maybe intelligent design?
Caution: Contents may have been coded under pressure.