What I do appreciate: XMPP built into the system, well integrated.

But still no OMEMO support. No other app available for that. I cannot simply install Dino on SailfishOS.

I do have a SailfishOS phone, it mostly lives in my drawer, as there are too many things that keep me from using it, unfortunately.

EDIT: Not really a fan of Flatpak, but it'd certainly help with software availability and I do hope they will add it.