Because of the lack of any sharing features, the tp-link recommended way to share is to give some your account credentials -- which means they have full access to your devices. Of course that's a dumb way to do sharing.

Slightly less dumb is to put each device that you want to share on a separate account. So that way you can share just one device with someone. Of course they can screw up that device because they have full permissions but they can't screw up the rest of your devices.

However, the app does not support any way to switch accounts. In the absence of adding secure sharing (which is what I really want), when will the app support account switching??