For example in mod abuse cases, or when you want to point out that you shouldn't be banned.

This is a two-edged sword. It has benefits, such as the ones you said in the title. However, it also has consequences. For example, when a toxic user rightfully gets banned, they may harass the moderator that banned them.

Though, if that happens, then the stream mod can simply report the user to the site mods. So the benefits outweigh the consequences.

Fr.

I was comment banned once, and they deleted the rest of my comments and banned me again, with the two bans overlapping.