True, it makes a lot more sense to me when talking about a reply, I think, because there is a second person involved that one can be kind *to* or helpful *to*.

The posts I make are often things like "Here is a picture of the socks I just finished knitting!" or "I wonder how they got the cherry picker into the subway station?" - I'd claim that they're benign, though helpfulness-neutral and kindness-neutral. At worst, they're boring, but I'd hope not as bad as "best to have hit delete instead".