What would be a usecase for this? My first though is that you could have a lot of strange things happening when a state goes to “Unknown”, for example.
Let’s say you have a 3d printer and you want notifications for all states except when all goes well, then using not_to: ‘printing’ would alert when there is an error but also when the there is no connection, or when it runs out of filament.
Another example. Get location updates of your kids, except when they are ‘home’, etc.
To work around with what we have today I do the trigger as just state change, then in the condition start with a not, then the state that you don’t want inside the not condition. I can send a screenshot later if you need.