DBD::Pg: why prepared statements

Hi,

I don't know if that is the right list to ask but the right people are
probably here.

I wonder what is the reason to use server prepared statements by default
in DBD::Pg. What are the benefits? For what I have seen so far, all my
queries are replanned every time. I haven't seen a generalized plan yet.

I am asking out of curiosity, not because I have any problem with it.
And I know how to forbid server prepared statements.

Thanks,
Torsten