Yea that’s fair. There was a pretty popular WTH post about getting this configurable in the UI as part of entity configuration. I even threw together a hacked up mockup somewhere down the discussion lol.
Btw for your second use case, you can use customize.yaml to add custom attributes to your entities. So if you want to add an attribute of not_dimmable to your non-dimmable lights you can do that with the current featureset. HA won’t look at that attribute as part of service calls but you can certainly leverage it in automations and templates.