What strikes me is the confidence with which you talk about a community you don't even know, lurking around threads and cherry-picking opinions that fit your own view of the game. What's more, you have the audacity to make arguments based on percentages as if you had conducted some kind of data analysis study of the community, when in reality, you're interacting with barely 10 people on the forum. It takes some nerve to come here and tell everyone how things should be done when you've demonstrated so little.  And I'm genuinely surprised by how someone can be so confident in their opinions while telling everyone how things should be done when they've demonstrated so little, let alone making claims about an MP community and player base they don't know at all.

Well, it's not the profile of most people here, considering the nature of the game, you might have more luck in a roleplaying forum (or maybe something on Reddit?), or, you could make a mod where it makes sense to have more complex diplomacy, commerce, and so on, and hope for the best (or you could check existing mods for one that is more aligned with that).

I didn't took me the time yet to review them.

Here is my improved Mediterranean skirmish map, spent lots of time on this so hope you enjoy.    Factions are pre set: Carthage, Roman Republic, Egypt, Iceni, Macedonians, Seleucid Empire, Lusitani, Germanic Tribes. mediterranean_diplomacy.zip

I think it all boils down to the fact that 0ad is a great game in essence but does not have such a great online community, a lack of willingness to try new things or enthusiasm to do anything but rush build, fight, win or lose style matches, take my roleplay discord for example, i started that with a lot of enthusiasm thinking people would be interested in trying it out but apart from 2 people mainly just one person the lack of enthusiasm has been saddening and has also resulted in myself losing enthusiasm to do it, not meaning the forums or any you guys of course.