Thanks for the info. I am not trying to be fussy, but I guess the question has to be asked: What can you actually do with the merchants, diplomats etc. With the Crusader Kings III game, you can build towns etc, but that becomes quite boring after a while. I guess what I am looking for is some (optional) micromanagement of economic development.
As an example, maybe researching civil technologies, that can be used to give you benefits, or be used to produce luxury items that can be traded. Am example of a luxury item may be especially converted jewellery, longed for by kings, or clothing of a special kind that empires desire, and are willing to trade with you. Arab nations may have dried figs, or other delicacies that are required by kings courts. Some thing like that.
Maybe trade routes could be protected by armed escorts, and escorts gain experience much like in battle. Mini mission could be to successfully deliver a wedding ring to a kingdom having a wedding. Or to provide the item as a wedding gift to gain diplomatic favour.
If you had a flourishing clothing industry as an example you may receive visits from kingdoms wanting to try your wares, improving diplomatic relations.
I am really thinking on the fly, so there are probably many more ideas that could benefit the game play.