I would very much like a gameplay that shifts away from battles and more into kingdom management (with the occasional battle ofc),4X games do this very well and should be taken as inspiration. For example in civ (your mileage may vary) you start by
- founding your cities, taking care of the barbarians,
- then you start optimizing your projects, do a religion, start some wonders
- then the race against the others factions
bannerlord should get something similar, I would tie it to the clan system and the kingdom system to give them some much needed use.
Beginning would be about yourself, then about defending the kingdom you're in, then once stable enough about managing it (or part of it).
Something I remember well about warband is that in the late game, the only time I was in a battle was for a siege by an army I was leading. most of the rest of the time I would spend trying to please the nobles, solve disputes, try to optimize my fiefs, or just waiting. I had spent enough time fighting and wanted something different.
Meanwhile in bannerlord not only can't I do that, but the fighting is even longer while being more boring.
some other ideas :
- warband had the marshall that managed the army, something similar could exist for the economy, the nobles. (bring in more money for the former, prevent defection for the latter)
- as I said before giving each clan tier a new perk the tier below didn't have
- when king you should rarely have to lead a party, outside of maybe some rare army leading. That is unless you delegate the tasks above to some NPC for you
- The possibility to convince other NPCs to simply surrender, have some barter not related to money, the possibility of being a diplomat that allows for peace or starts a war
- naval system as discussed above
- give some other use than voting to the influence, like recruiting high tier troops, convincing nobles without money.
- add in renown decay
- change the salary of troops : I could barely afford 50 swadian knight with a town in warband, I can run a 300+ tier 6 troops bulldozer of a party with two towns in bannerlord
The marshal system already exists though, it's just done differently so there can be more armies and makes use of the Influence currency with relations determining Influence cost.
I don't like the idea of restricting gameplay mechanics to clan tier; I can only tolerate it here because it makes sense guilds and the like wouldn't trust a random hobo to own property but it doesn't make sense that they'd be skeptical of a well-known nobleman with a good financial history. Like, there's no good in-universe explanation as to why I need to be super-royalty to own one more store or have one more companion. I strongly dislike the way clan tiers operate because it's so gamey, but it doesn't bother me much because it's mostly ignorable and some sensible uses of it (restricting access to nobility and viability of creating a new country) actually do justify it.
Troop salaries are already very expensive in Bannerlord compared to income sources. If you stack a city with top tier troops, you'll be in the red unless it's a very high prosperity city. Even a stack of mostly crappy troops is expensive, never mind having top quality troops in your own retinue + clan parties. Bannerlord has a much larger scale for battles and armies than Warband, so 300 troops in this game is basically 50 in Warband and, in Warband, business (especially Velvet Dyeworks) were extremely profitable so once you set up enough your financial concerns with troops were a thing of the past. Not so in this game.
Renown's pretty useless besides obtaining Clan Tiers, so I don't see a reason to have a decay for it since it doesn't contribute to anything tangible (like troop count limits) like in Warband.
Since this is supposed to simulate a highly decentralized European-style feudal world, kings actually have to be active and busy themselves to get anything done on a national level so that checks out thematically, but I do think more stuff to do besides fighting would be a good idea. However, I would like it if it were possible to centralize power more and I think the framework is already there, just need to be able to have more influence (not currency) in determining vassals' actions, like a little speech minigame to convince them to attack or defend places or form armies for the purpose (etc.) similar to Warband.
As for my own original ideas...
Well, I'd take inspiration from Koei strategy games, especially Romance of the Three Kingdoms 6-8 and 13. From 6, I think it'd be sweet if we had to take care of our vassals mental needs (like I described above) and from later entries it'd be cool if there were more official bureaucratic stations like advisors, ministers, and regional commanders (although to go all the way Bannerlord would have to fundamentally change since a more centralized government structure would easily beat out the heavily decentralized feudal structure that currently exists). Not to mention schemes such as sapping city defenses, degrading public order, arranging timed defections, planting moles and other types of agents, alienating nobles so that they're more willing to leave/defect, etc plus counter-measures to protect/restore these things.