I like to think that making mistakes is part of being human, at least that's my excuse,
I feel that when an action can be destructive, either irreversible or even only complicated to undo, then some type of "give pause" is good to have. For example, I might become annoyed e.g. "yes I want to delete. l wouldn't have clicked delete if I hadn't wanted to! cheesh, stupid software". But all those repeated confirm dialogs are no where near as annoying as clicking on something only to find out that I shouldn't have clicked.
Creating a topic in Uncategorized is not destructive. True, it is a "bah, now it needs to be moved" that can be a bit irritating. I have done it before myself, I know. But at least for me, I often learn from my mistakes and after doing it once I now know to give a quick look at the category select to be sure the topic is going where I intend it to go.
Long story short, pick your battles.