What’s the difference between the Share feature in Device Settings and Family device sharing?

Device sharing using the Share feature has been deprecated. Please use Family to share device access instead. We will disable this feature shortly (most likely before 2021). If you have previously shared device access with this feature, we recommend that you delete the sharing and, instead, add the shared devices and people you’re sharing with to your Family. We will send a few reminders to you before we officially disable this feature.