@zeh

contrary to your claim

This is not true. I never disputed that Briar, Cwtch and Session route the traffic through mixnets by default.

makes it easy to route through tor, on top

Not a unique advantage of SimpleX, you can also route Signal through Tor just fine.

The exact same article you linked to also notes that:

That isn’t to say that federated encrypted messaging apps cannot ever meet the bar set by Signal. But they should focus more on improving their use of cryptography than weak arguments about jurisdiction or data sovereignty.

Signal provides top-notch cryptography, great usability, as well as a large userbase. Network-level privacy is each user's own responsibility. Imagine if every single app on your phone that makes network connections had its own VPN/mixnet client. The UX and battery life would be horrendously bad. This is exactly why all modern operating systems offer an API that makes it easily to globally connect to a VPN. Some VPN clients even allow you to only route specific apps through the tunnel, if that is what you desire. Commercial VPN services are becoming more and more popular, and almost every user has at least heard of them. Most people just don't use one, because they simply don't need it. The situation is very different in countries with heavy internet censorship like China, Russia, Iran, Saudi Arabia, etc.