Below is the answer from our engineers team, pls kindly check:
1. Activity will track the on/off state of the device and make a judgment on whether it needs to be turned off/on. But this requires the device could only change the power state in the Activity, not switch the power through the device
2. Regarding the second point, you can edit the device information, Edit---Power settings-----Always on, unless the Off key ispressed, so that the TV will not be turned off when switching
3. The problem of slow activity, we will improve it in the future
4. The code base is incomplete, please provide the brand and model of the device, and we will try to add it to the database, tks for your support