Sometimes a coup quest is given to a city-state that is in someone's sphere of influence. This is not good (and impossible). We must respect the decisions of the World Congress.
The Miracle Projects from Congress seem somewhat unbalanced. First place is a very chic award, and second place is incomparable. In particular, the Canal construction project is the possibility of repairing ships outside friendly waters. And for the second place, the frigate and 3 units will not consume upkeep. The value is incomparable.
To take first place, you need to switch all cities to production and rearrange the entire population to mining hammers. And after completion, all this is returned back, which is a very long time with 15 cities. And the first place is absolutely not guaranteed even with the strongest economy in the game, if there is no Great Engineer to use for the project. I produced about 1700 hammers against 1200-1300 of the nearest competitor, 7 states built this Channel exactly 1 move, but I finished in second place with a lag of 700 hammers. This is absurd.
As a result, for 1-2-3 turns, we completely stop the development of the state for the sake of 1 frigate and some savings in allowance for 3 units (about 7-8 coins).