Wrong signal
It sometimes feels like the security community is a bucket of crabs where any time something starts getting traction due to ease of use a lot of others try to pick at it due to it not being perfect even if many of those things are trade offs<p>- phone numbers allow for signal to be a drop in replacement for other messaging apps with minimal to no registration required, I doubt I could have gotten my mother to use signal without switching from texting being so low-friction.<p>- lack of federation means ows can control spam better unlike in a federated environment where lazy&#x2F;malicious operators can cause lots of problems.  Take a look at the 2 big federated protocols email and irc where due to spam and other issues they are both increasingly centralized.