Different headgears and cards are made for a reason.
I believe that their exclusive effects shouldn't be seen
in other items, rendering the original item useless.
Granting immunity to freeze in a Forsaken Soldier card
will not only make fhelm useless but every single expansion
headgear in the server.
There are good and bad in using any item.
When you choose to wear skull aura over emperium aura,
you lose out on the +5 stats but gain in terms of damage reduction.
As Beautiful said, you gain something, you lose out on something.
It makes sense, so yea, -1 on your suggestion too.
Thanks for your effort though. (: