I think the only remaining feature I care about in #DeltaChat is better support for large attachments but that's a harder problem.

The comfy feature I'd like but has security implications would be link previews. There's a bot you can add to a group chat which will produce the "quick view" or whatever of a page which is a static HTML snapshot but traditional link previews are nicer as it's rendered as part of the original message.

Besides the security implications of it there's also the uphill battle of sites breaking link previews because of AI scraping concerns so they whitelist iMessage/WhatsApp/Telegram access which screws everyone else over. I see it with Pleroma sometimes -- links won't get a preview because they 403/404 or just don't include the meta tags