Why do we bother doing this?
Every time you edit, your account name is "stamped" on the edits you've made. If your user page is un-created, page histories get filled with redlinks that unhelpfully lead nowhere. By force-creating your user page, we're ensuring that it's easy to find you.
But we're absolutely not saying that you have to keep that automatically-generated message. Change it up. Personalise it. Make it something that reflects your true personality!