Email isn't a good protocol for instant messaging (it wasn't designed for real time communication and it lacks some features like typing indicators or voice/video calls)

Why would you prefer XMPP? Last time I checked most features (like E2EE) weren’t part of the base protocol.

Just because it is not part of the base protocol, it doesn't mean it doesn't exist or supports it.

I like it for personal reasons. Just because is lightweight and there are way much more servers than matrix, imho makes it better. However, In the end it boils down to personal preferences and your attack surface.

It supports mail, but also has an encrypted normal chat backend AFAIK

WHen i tried it years ago, it was just a normal email with a special subject that the delta chat client would read, parse and display.

Maybe add Signal; It’s easier than Element, but it’s also centralized

signal runs on amazon servers. Anything that can't self host and isn't federate isn't worth it. Matrix (and element) fill this requirement. But IMHO, the best is XMPP where you can self-host or use federated servers located in other countries.

Maybe add Delta chat

Delta chat is basically email.

Remove Stremio

Why? Because it's torrents?

Other alternatives would be viaplay or britbox. Unfortunately there's no legal alternative that's available in all europe.

Add aurora

Aurora is just a front-end for google playstore. You should add f-droid