I'm not a huge fan of whenever someone scoffs at an idea by comparing it to real life. No, you wouldn't reach your hand down inside of a trash can and start editing a document. Nice observation, but I like that software allows me to do things I can't do in real life, like post my thoughts and instantly have an audience that can provide feedback - and no, it's unlikely that I would write my thoughts on a piece of paper, leave it somewhere in public and check back to see if anyone replied to it, but that's neither here nor there ;)