WTH are there no blueprints for dashboards and UI

It would be great if you could define (card-)blueprints with input parameters for (parts of) dashboards.
For example, you could show the door sensor, some lights and the temperature on each room dashboard by simply adding a blueprint/template card and providing the required entities as inputs. It would also be very easy to change the look and feel of all the room dashboards afterwards by simply editing the blueprint.

I know there is a way to archive this using strategies. But I would prefer an easier and more blueprint-like way.

For cards - it is already possible by a custom decluttering-card.

I set up and still use custom decluttering-card. Great to have it!
But it is not easy to set up, definitely not for an average user, and it is custom.

I see not only the use Case to set up repetitive cards for one self, but a tandem to shared Blueprints, where a Setup gets directly displayed in a nice, preconfigured Way.

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I would love to share such UI-blueprints. It would be so much easier to create a custom dashboard using community-created templates for specific needs.

A partial or complementary solution would be to make the !input of a blueprint available as attributes of the blueprint.
For Reference: