Survey--Thank You Letters

My supervising partner from this summer told me that he has instructed his secretary to throw away thank you cards from interview candidates. He doesn't have the time to read them and they don't offer any new information.

He does however glance over thank you emails and prefers them over the cards, particularly if they include a more thorough response to a question he asked in the interview. However, another partner at my summer firm expects a physical Thank You card.

Seems like the only solution is to send both. Also seems like sending two thank yous for a 20 minute screening interview is ridiculous overkill.

How did y'all deal with this?