[a bit of a rant] Starting to consider using Hubitat purely for Zigbee/Zwave and HomeAssistant for everything else

Is the hubitat source code available on github? if it is then that's awesome.

I've been working with Open Source for over 20 years now and made a career from it, however as far as I can tell Hubitat isn't Open Source even if the community plugins are?

Quite possibly, yes, it's just a bit frustrating that many devices that aren't available here in the EU/UK are supported, and yet so many devices that are available here and in the US aren't supported.

And it's not always complicated things either - I've had to jump through hoops to get album art displayed on my dashboards from my Sonos speakers, that works out of the box in HomeAssistant and it feels to me like it's a pretty obvious thing to want on a dashboard.

I don't mean to come across as ungrateful, I appreciate that my priorities are not the same as other people's, and it may well be that I need to run some kind of hybrid setup as you say, it's just a bit frustrating when I thought that Hubitat would support a lot of the stuff out of the box and yet updates seem to focus on fixing existing drivers rather than adding new ones.