If you're going to take away espionage in alliances, Firaxis, at least give us something else instead. For example, you could make it so we can send spies to allies as diplomats, where the mission choice would be less aggressive in nature (e.g. WC votes, using each other's city-state bonuses, etc.). You could even tie it to the new diplomatic quarter, where the district and buildings unlock diplomat slots, and maybe improve diplomat abilities. Those are just some ideas, but I really hope you don't leave it as it is.