anon6357814
For example you can make multiple identities easier. I make use of that here via firefox containers, it is quite nice.
You can make anonymous the default and track the user under the hood, allowing them to claim a post at a later point if they feel confident enough to attach their name to it.
You could limit who can see the user identity. Or only display something more vague than a specific identity, a profile-lite behind a one-time ID.
I doubt that necessary is the correct choice of words here.
This is mostly a gut reaction, a feeling that CoCs serve more to tighten the overton window and fear that I might find myself on the wrong side of sharp demarcation which should be more of a soft gradient. It's like a wanted poster, being declared a thought criminal.
Of course many things in a CoC are individually sensible rules, but as a larger set they feel like a demand for a flawless human who is always genuinely nice, polite and only makes perfectly inoffensive jokes and never raises their voice while arguing things etc. I'm quite aware that I am not that perfect human, I have issues with empathy and following what was considered group consensus (it has cost me friends and a job before). Those CoCs just feel a bit like a "only people with A-grade social skills welcome here" sign to me.
4chan also exists and it works and is marvelously non-toxic once you realize that any insults hurled at you are impersonal because they can only attack what you have immediately posted previously. Your attack surface is tiny, assuming basic information hygiene.