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> my experience with XMPP is that was not as solid as other solutions, including closed source ones.

Considering that WhatsApp is essentially an old/non-federating fork of ejabberd (from where this blog post originates), I think XMPP is doing alright in that regard.

Looking at how many years ago the fork open, you can easily guess that the protocol doesn't look anything at all like XMPP.

For sure, it got continuously refined for WA-specific needs over the years, but XMPP very much still is there, lurking in the shadows: https://www.sciencedirect.com/science/article/abs/pii/S17422...

Extensible, extense thineself.

"not as solid" - please explain.