My point wasn't about the power dynamic but rather the perception of effort/thought/care. Even though the message is the same, whether it's "Will you marry me?"

My point wasn't about the power dynamic but rather the perception of effort/thought/care. Even though the message is the same, whether it's "Will you marry me?" or "Will you consider this political stance?", the perception around the delivery of the message is still taken into account. Writing a physical letter introduces a barrier of effort which separates a two minute slap-out-an-email rant from a carefully composed and considered letter. Imagine if commenting on YouTube required writing a letter? The quality of comments would increase by many orders of magnitude.