If you're not delivering bad touch to opponents then why take cartomancer?
A vast majority of the time you could already deliver heals to party members with a base witch's familiar without risking it.
Why lose the hex and familiar benefits, if you aren't going to do what the archetype brings to the table?
Losing a familiar(and improved familiar possibility) isn't nothing, you need to exploit what you gain in exchange to be worth it
1. Theme.2. It adds bad touch at range to my repertoire at the cost of a single hex.
3. I don't have to worry about my spell book dying.
The bad touch has been great, especially Touch of Idiocy. I just don't see the value in giving up 2 precious hexes in order to get precise shot. If all opponents are engaged in melee with party members I can use hexes, non-touch spells, or simply ask a party member to 5 foot step away so I can throw a card.