Ain’t Technology Wonderful!
I guess official integration does not mean cross-platform (classic - new apps) performance. It only implies new application operation is acceptable.
Functionality: I also find the functionality limited. Example: Energy Monitor plugs in the official integration do not display any of the EM values (particularly power, energy). The unofficial integration does this now in the new app and even more data in the classic app.
Going Back: In the new app, you can stop automatically adding in the settings. Then you can remove the devices, go to the classic app, add my app again (sigh), etc. With auto add off in the new app, the bulbs will not be added back (so no duplicate bulbs).
Devices reinstalling after being deleted in new app: Again, you can turn off auto-add devices in the setting of the new app.
Dave