It's not going to make sense for example, if ARG/ANT or ARG/BOR suddenly turn on each other without a valid reason. I could see several potential causes of conflict between both MIN/TEL and TER/PIO, but that should be for future plots to explore and expand upon, not via a generic random/dynamic diplomacy mechanic.
What does make sense however, is the idea of "Coalitions" and "Ceasefires". If one faction (which in most cases is likely to be either the player or the Xenon) starts to get too big at the expense of two other factions that are warring against each other, such as ARG/ZYA, then they should put their differences aside to work against the the larger threat. If the threat has been neutered, then hostilities could resume.
I'd also like it if for example, an aggressive faction such as ZYA, accomplishes its main goals (killing the North Xenon cluster and wiping out the NE ARG cluster). Then they shouldn't just stop there (due to the way they're written) and do something like breaking the Heretic's End MoU or declare war on PAR or TEL for even further expansion.
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That would be the ideal diplomacy additions for me in theory. But then you'd also have to consider what happens if multiple of these scenarios happen at once. What happens if there's a Mega-ZYA, a war-mongering TRI and victorious TER all happening simultaneously? Does TRI cease it's war with ZYA to deal with TER? What happens if TER does its win first before TRI forms? If the player chooses ANT/ARG to hate each other in the TER plot, does that then prevent them from joining coalitions with each other? It's difficult to add in practice.
There's so many scenarios to think about. A good diplomacy system is NOT easy to implement. There are many ways it can go wrong and many paths it can take which will not make any logical sense. This is why I like the plots that end up making diplomacy choices because they give the player the rationale for it to happen. I only wish that there was more options for diplomacy changes when certain events occur. Here's a few ideas:
- Option for ZYA to declare war on PAR and/or TEL once they've beaten both the ARG/Xenon clusters (can be limited to "Spear of Patriarch" start).
- Option to dob in PIO to TER over their AGI usage in the PIO plot that could lead to two paths to cause a direct annexation of PIO by TER or a war of independence for PIO against TER. This should come with the ramifications of slowing or disabling the terraforming mechanic.
- A mini-plot offered by either ARG or ANT to expand the fractures caused by TER in the ARG/ANT relationship that could escalate into full-scale war.
- New plot involving MIN focussing on their militarisation and expanding cultural differences between them and the rest of TEL. This should result in MIN seizing some TEL territory near their shipyard and declaring war on them.
- Option for a liberated YAK to join the war against TER on the side of ARG/BOR/ANT before the player completes the "Covert Operations" plot.
- Option for CUB to declare war on TEL once they have fully defeated ZYA. They are still war-mongering slavers after all.
- Option to dob in HAT to ARG, which can lead to ARG annexing Hatikvah's Choice I, forcing the rest of HAT to return to their pirate ways. Dal Busta can still end up with the player. This disables the sub-mission for BOR to give HAT fighters.
- A mechanism for the Heretic's End neutrality to end without player intervention.