I’d like to be able to edit a scene in the UI without it affecting the devices while I edit it. Reasoning is I don’t want to bother the family while I’m tinkering in most cases especially when I’m modifying scenes at night and don’t want lights to turn on. Also, some devices take a moment to change states (e.g. my IKEA blinds take ~10 seconds to roll up/down) and saving the scene while they’re changing states will cause the scene state for the device to be incorrect.
It would still be nice to have an option to “preview” a scene while editing it in case you do want to see it reflected on the actual devices.