Entities missing from Entity Registry?

Why are some entities missing from the entity registry? I was hoping to use it to customize names of my sensors instead of using the customize.yaml file. Or have I misunderstood the purpose of the ER?

The entries that are missing seemt to be all mysensors and tellstick entities, does the platform need to support ER?

Only entities of integrations that support unique names are entered into the entity registry. as you’ve seen not all do.