I agree, we are running into the same problem. I was just on chat with someone from HubSpot and was told there’s a practice mode for the highest level, but we are barely even scratching the surface of the level we are on and need to train our staff much more rigorously before thinking about investing in a more robust platform.
Having a practice mode would alleviate this need to be able to delete items once submitted and give us a safe place (meaning no clients will be sent incorrect emails) while our staff trains.