It is unfortunate that some modules have limitations.

A file slitting module that cannot split files greater than it can hold in memory is more than a little bit limited.

But I don't believe that we should ignore CPAN or discourage the use of modules.

It's not a matter of "discouraging the use of CPAN". I've never done that, and never would.

It's not blindly suggesting the use of modules for either a) inappropriate uses; b) or because the "name sounds right", without having looked inside to what they actually do.

Especially as a replacement for existing, working code that doesn't have the limitations of the module you are suggesting.