Shared management: shared home or shared device

What is exactly the difference between ‘share home’ and ‘share device’?
When do you select each of these two possibilities?

I copied this from the eufy help.

With ”Share Home”, devices are either added or removed from a specific Home profile and it is not necessary to share the same Home profile again. The new device information of the specific Home will be automatically synchronized to other shared users.
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(Me): this sounds a bit confusing, the way I read it this means that you can share all your devices with someone else. Example friends and family.
Provided they have the eufy app installed on their phone and you send a request / link to them for sharing devices.

On the other hand, “Share Device” emphasizes single device sharing and is more flexible. It is used when you want to share only certain devices.
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(Me:) this one you can choose what device to share. Like outdoor cam, doorbell, motion sensor…