I'm still not convinced that Solus is real. I've never seen DataDrake or JoshStrobl outside of Twitch...
Jokes aside, as a fairly active contributor to Solus, I can say for certain that work is being done on the things you've outlined. As Josh and Bryan have mentioned, though, we're all volunteers right now. The more people step in to help maintain packages that they use, and the more people contribute to Solus projects like Budgie, the more time the core team can spend on infrastructure and shiny new features. Plus, with donations open again, they can now invest in hardware for a faster development cycle! Solus development is far from stopped.