Censoring a hug emoji because your client hasn’t implemented it is much different than censoring the text of a note. Damus doesn’t render markdown, but the words are still there.
I’m a bit confused about what you’re arguing for. If relays already censor, and we cannot verify what they’re doing, how does it help to have an open-source client that explicitly tells you they censor? That’s just adding more censorship.
At least if I feel like 5 relays are censoring me, I can add 10 more. If I’m censored on Amethyst, I may never know that 1000s of people aren’t seeing my notes, and they also don’t know I even exist.