The XSF has a fantastic page dedicated to debunking common XMPP myths. Here are a few examples:
• XMPP is XML, so it must be slow • XMPP isn’t secure • XMPP doesn’t protect privacy • XMPP is too verbose • XMPP is unreliable • XMPP isn’t suited for the web
@ejabberd Right after the Snowden revelations, people have started looking for end-to-end encrypted solutions, including OpenPGP, OTR, SpiderOak, and ProtonMail.
OTR was limited, it took a few years to develop OMEMO, and omemo.top was created to encourage its adoption, regardless of the client UX or target use case. By putting the emphasis on E2EE, this platform has been part of a trend (along with ProtonMail etc.) of neglecting every other aspect of computing.
I'm talking about Firefox OS early adopters, high-profile distro contributors, etc. They might have revised their opinions but they felt, to some extent, an urge to lead by the example; some of them were successful, some others were burned out.