I have been testing it for about 3 years now (FOSDEM 2019 made me interested again)
I started pulling people to it only a few months ago when I thought it was good enough (includes almost no encryption issues happening in all day usage)
My mom uses it as well. It works fine. I had to install the app though, like all the other apps.
The reasons why I found Matrix interesting, were:
- Telegram like syncing messages across all devices while adding a new device is as simple as setting up WhatsApp Web
- It's a standard for interoperability - I got sick of telling others what to use and being told so by the network effect
Copying Wire or Signal just wouldn't work for technical reasons. I also wouldn't want a copy.
I got all of your recommendations over time (including buying Threema with all my friends), but they just haven't been good enough for us and me.
In practice, no one cares about Electron. It seldomly VScode or Teams are used at work