Remember interoperability?

Remember back in the day when there was interoperability between messaging platforms? When the hope was held out that we would all be able to seamlessly chat, with a single app, a single account, with anyone, just like we can send and receive email with anyone, regardless of how and where they manage their email.


Now I have this:

The many messaging apps running on my desktop all the time.

Skype, Slack, Teams, Android Messages, Telegram, Zoom, Signal. Oh, and email.

I have all the same apps running on my phone too.

Where did we go wrong?