I think visibility is good. Users need to see which relays are not honoring delete and hold them accountable.

A "request deletion of entire mesage thread," however, would be an excellent feature.

Click and hold, delete. But unless you have a good relay, it won't matter. Also, relays can delete all your DMs with a simple request. Amethyst can only do one by one.

Yep, but without relays actually deleting them, the message will come back over and over again, just to be deleted when the phone loads the deletion request locally. Nothing Amethyst can do beats a good relay.

Is there a normie friendly micro client out there with this all DMs function?

I still do not see a button for this. If its there its well hidden. I am not trying to delete my own messages, I am trying to delete unsolicited conversations to declutter the DM's.

On the client, you can only delete your own things for now. But on your inbox relay, you can do whatever you want. That's why it is so important to talk to them. We will develop features to hide events from others but if they are not erased from the relay, over time they will just consume more and more data.