I often recommend blabber.im/en to people that's just a fork of conversations (xmpp) that's a simple install with sign up and modern interface for non technical family and friends....the only problem is we need cross platform apps so no matter what device, the experience is the same...that includes desktop
There are modern frameworks that generate the same app for different platforms. Look and feel may vary because e.g. iOS and Android have different design guidelines, but that is acceptable. An iOS user will want an app that behaves like other iOS apps, anything else would be confusing and frustrating.
Let's hope the larger xmpp client projects go in that direction...
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