Modern template sensor definition style: how to initially set entity_id and friendly_name (and what about availability variables)?

Configuration
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sure, I have all I YAML too. No problem there with my config suggestion. It allows for editing in the UI if you add a unique_id, it doesnt force you to.

Why would you say I

?
Merely suggesting… also because of 2022.6: Gaining new insights! - #356 by Mariusthvdb