Banks deny e-signing -- require wet signature

This issue has confounded me for years now -- I can e-sign my Federal taxes, I can e-sign my State taxes: there is a federal law the legalizes electronic signatures, and there is a California state law that legalizes electronic signatures.  Why then can banks and lending institutions deny use of them????  They (some, not all) want "wet signatures.

Well I finally got an answer - it turns out that e-signing is legal and allowed but not required.  By that I mean, it must be agreed to by both parties in a contract (That Explains It) -- both parties must accept the "new", modern, method for signing.  So it appears that as long as they care to "hold out" on the e-sign process, we have no choice but to play it their way -- This is Way to Sad.