I agree with you, but my brother, an incredibly successful developer who several years ago made $350 an hour or something like it, also de-invents the wheel. He says that for his website he will never upgrade from Perl 5.00x unless he has some reason to. Guess he figures upgrading can break things.

That is not my philosophy, but it does make a certain amount of sense. Upgrading does sometimes break things. I once installed a newer version of the CPAN htgroup module on an old Perl 5.00x set up. Broke it. The developer had not tested his latest module on very old Perl interpreters.

Fortunately the developer fixed it immediately, but still. Maybe de-inventing the wheel can be good in some instances.