Are you looking in the right place? In firmware version 184.108.40.206, that informatino is shown on the "Apps" page under the listings for the Groups and Scenes app. I don't think its shown in the Rule itself.
These show up once your Scene is captured. So the "On" means that whatever that setting is is the current state for those devices. "Not Set" means those devices are not in those particular states. Hope that makes sense.
Only if your lights support "Level pre-staging," which some Zigbee (and at least one Z-Wave, though I don't know if it made it into the official driver) bulbs do. I still avoid this myself, as I think a better approach is to include this as part of your "on" automation--set the desired level (or CT or whatever) there.
The built-in Motion Lighting/Mode Lighting app can handle this, but this is tied to mode (which many people use as a proxy for time) rather than strictly time. I see you have a few other ideas above that might work for you too. There are lots of ways, as usual with Hubitat, and RM will of course let you do anything you want if you write a rule for it. But my suggestion is to start with the apps created specifically for this purpose, since that will be much easier if they already meet your needs.
I think the core issue I'm going to have is most of my fixed lights are controlled by GE z-wave plus wall dimmers which don't have a way to pre-set a dim level. So even if I find an elegant way to define dim levels based on illuminance or mode I'm going to have an issue pre-setting the dim level.
One outdoor sensor is the Hue outdoor motion sensor. It reports illuminance infrequently even though I've set the granularity on it's device page to 1 Lux. My workaround is to do a refresh on it every 5 minutes between sunrise and sunset.
As for services...none. I'm very much a local-only guy and I block many devices at my firewall, including HE, from ever getting to the Internet. That said, I obviously have to allow the connections briefly to get updates to any of those devices.
Anything I say to address that would be speculation because I don't have an Echo and I didn't even consider using the dashboard. Sorry.
It is very powerful and not too hard to use...once you get the hang of it. It's way different than doing things in HE (note: I have never tried either HA or WebCore). That's both good and bad. A very common comment on NR is it's a
Tip: run it natively if you can and in Docker only if you have to. Some here will say Docker is the only way but I disagree (unless a person has other apps in it already) because it's one more layer that needs to be learned and managed.
If you do decide to dive into the hole you'll want to check out a couple topics here...
And there are many others, just search for node-red.