I have some TP-Link smart plugs and was happy with them for a long time because their app could be used without an account. Then I recently got the new version of the app and it forces an account, there's no more guest mode. I'm done with TP-Link now.
The whole Tapo/Kasa interop thing was badly handled too a few years back. Put me right off, when most were dangling the seamless integration carrot to distract you from the vendor lock-in.
