Regularly, I use the following for near-realtime communications ("text messages”).

- SMS/RCS/iMessage (friends, family)
- Facebook Messenger (friends, family)
- What's App (friends)
- ActivityPub/Mastodon (friends)
- Matrix (friends, work)
- Discord (work)
- Mattermost (friends, locals)

I'm sure I'm missing some.

The fact that no one is allowed to make a single piece of software (for wide distribution) that talks on all of these systems is the kind of garbage @pluralistic often talks about.

@sean Matrix does have a number of integrations. I'm currently using it to connect to WhatsApp, Mattermost has a matrix integration (https://mattermost.com/marketplace/mattermost-matrix-connector/), and I believe there are other bridges for Discord/etc.
It's not a perfect solution, and is somewhat tech-heavy to get working well, but it's better than nothing?
Mattermost Matrix Connector

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Mattermost.com