Depending on the implementation, I feel that DIDs across ActivityPub could make the aspect of interoperability between different services much more appealing as well. While I think it's interesting that we can directly interact with posts from entirely different services like Mastodon, Pixelfed, Peertube, and Friendica, I find it difficult to make the feature make sense for daily usage beyond the convenience of not having to open another site/client for a singular interaction. I feel like it makes sense if you only prefer a single service/format for accessing content, but every software implementation handles content differently, with differing formats, features, and limitations. They each specialize at accessing and presenting the fediverse in their own ways, so there's reason to use each individual application. If you still have to make a separate account for both instances to interact when using either of them, I feel that defeats the purpose of the interconnectivity aspect. By being able to connect the same account to instances between different software, I think this would strengthen it.
emzzy
I use KeePassXC (KeePassDX on mobile) synced via SyncThing for sensitive/important logins, and Bitwarden for practically everything else.
I'd suggest SimpleX, personally! Not only does it not rely on phone numbers, but because you add people through single-use links instead of using identifiers, there is no contact information of yours to be shared without you actively choosing to share it with someone yourself. I'd say it's pretty approachable, and the actual messaging experience is packed with a nifty feature set.
While I agree that it's important for people to have an understanding of the values that the fediverse are founded upon, as well as associated etiquette, I still don't think that the fediverse itself needs that much of an explanation for people to reach that understanding. Though platforms may provide tools that can be used for malice, a tool is only ever as good or bad as the intent of the person using them. I don't think someone necessarily has to understand the technical aspects of the fediverse to know how to treat others. Maybe to put things in better perspective, like how much of a communal aspect there is to the efforts that maintain this network, but I think most people will get to that understanding on their own regardless if it's truly in their intent. Inclusivity and kindness aren't concepts that are unique to the fediverse, but human concepts that people learn, and unfortunately unlearn over entire lifetimes. And above all, I believe the best way to teach and convey values to one another will also always be the most intuitive: by example.
I only find it useful on laptop keyboards. I like the numpad for entering numbers, and I also like having dedicated keys for stuff like Home, End, and Insert when browsing or editing. It saves space when you can double the numpad for both.