This is why I comment only using throwaway accounts on all the forums I use.

I feel like I'm much less likely to get attached to an opinion if it's wedded only to an ephemeral identity that I will probably forget about entirely within a short timeframe.

I also much prefer the dynamic of having anonymous conversations with strangers.

I heartily agree about preferring anonymous conversations.

Though for the first point, personally, I view being “attached” to a particular idea as more of an external problem than internal. An alias lets me consider other ideas or play devil’s advocate or perhaps more importantly, write with less revision than I might require of my public persona, which can be the difference between making a post or deleting another imperfect draft.

I can understand the appeal for a forum operator to lock functionality behind reputation-based systems which dissuade temporary aliases to reduce spam, but I think it is vitally important to have anonymous spaces for conversation.