I always felt like I always run the same edicts and all other ones are weak. Talking about Rome in particular but I think most factions have the same edicts or most of them (I haven't played DEI in a while and I never played some cultures). Back when I started playing DEI I only used Bread & Games all day long. It's so much stronger than the other ones, especially in the early game. Growth is key and keeping public order under control is vital. You can take the food hit because you end up building farms and fishing ports everywhere anyway (you know eventually you will need much food).
Then I also used Tax Harvesting in the mid and late game once a province is fully developed and under control. Party Loyalty I never used but I can understand its circunstantial use. I occasionally used Sell Slaves to get rid of the public order penalty in provinces where this was a problem.
Other than that I never ever used any other edict. Except my current Roma run, where I am running slave based economy so I use Sell Slaves to squeeze money out of them and Commercial Stimulation to stop the slave population decay.
But edicts like Import Food and Export Food I never saw a good reason to use. The Export Food penalties are too punishing for little gain since agricultural income is usually the weakest of all types. Import Food feels like a weaker Bread & Games. Romanisation could be helpful to boost cultural conversion but honestly the value is too low, not that it matters anyway because it "caps" at 15 per province and from that value ahead it's just a matter of patience rather than boosting it further.
Call to Arms is probably the weakest. 10% recruitment reduction for a massive loss of important resources like food and growth? Pass. Also the army replenishment bit is not meaningful because it is tied to population anyway. I would love to see this edict tied to the garrison building (unfortunately none of the yellow tree buildings improve edicts) if this building provided a serious garrison to begin with.
I am not trying to bash on edicts here. Of course I can see improvements but the point of this post is asking you guys how you make effective use of all edicts we have. Which ones do you like to run?