I like most of these ideas I just didn't enjoy the ally limit from dp. Soi limits allies to whos near enough to fight which i kinda like more. Plus with soi incentivizing ocuppying everything you can. If theres an ally limit again small nations are gonna get grabbed up for soi range.

Maybe instead of ally limits doing something to make it harder for allies to join in your sieges. Like shorter soi range when checking if they can jump into your seige.

I considered the making it harder for allies to help... But I'm not sure how to fit that into the SOI system, because in a way it then penalizes your allies for your stance. If it's possible to do something like Ally SOI range (for your sieges only) -25% that could work, but I wouldn't want to try to figure out how to code that in. I was going for simpler checks or mechanics instead of complicated involved ones.

To be honest, the ally limits (In my opinion) would likely not have too big of an impact until someone went imperialist, plus the limitations for alliances being useful in the SOI system in the first place made me think that limits, even if they were kinda loose, could help make things more competitive outside of the typical 1-2 huge sieges a week we've seen for the last few months

Again you try to re introduce DP old buffs into SOI, as I said in your part 1 this is not viable and will only hurt the implementation of the new SOI system (very good system for all nations but us)
I'll leave the non interventionist for the end
You suggestion for expansionist is decent minus the ally part, bonus points for your offensive sieges and bonus points for enemy when they siege you is very good.
The imperialism suggestion isn't really meaningful unless the vassal shenanigans are dealt with
As for the non interventionist, great so far minus the fact you missed any economical benefits/buffs, and you suggestion does not reward nations for having long time allies. Neutral nations should have a hard time starting out and getting more and more benefits the longer they hold on to their alliances

This is how you give criticism.... with facts, not opinions

My goal was to take the system that existed and merge it with the new system. No it isn't perfect, but it's a starting point, and it reflects the system that existed before. I'm not trying to reinvent the wheel, just adapt it to work in a different environment.

The ally part in expansionist and Imperialist was a carryover, I didn't have a good way to replace it, same for Non-interventionist getting more allies, that was the best way to carry that over. Is it the best solution probably not, but I was trying to keep the spirit and intent from the original buffs from the DP system (I know it doesn't apply or work in the SOI system), but I didn't want to break from the balance that the old system that in its own way worked.

I really wasn't sure on the bonus points idea, that's why both of them are such small percentages, I think much higher and it becomes very balance breaking, potentially creating a nation that would almost never lose offensive sieges but almost always lose defensive sieges.

Imperialist suggestion does probably require a fix on Vassals, Personally I was a fan of _dogster's suggestion from two or three days ago. The imperialist buffs would probably need to be tweaked in some way depending on how vassals were changed, or would need to be reworked to not be so connected to vassals.

For the non-interventionist one, I didn't change anything from what was there before. there was no economic benefit before, I was not adding new benefits, I adjusted the benefits that were there to make sense in the new system. And I think it should do just as much to deter nations sieging neutral nations as the old system did. And if I'm wrong then I'm wrong and it gets rebalanced. My entire goal was balance, no one system should be superior in benefits to any other. Circumstances may make one better than another for a given nation, but nothing should be the definitive best.

Length of alliances isn't a mechanic that existed before either. I was trying to minimize introduction of new mechanics, since there's already a ton of new ones right now.

All suggestions are opinions. None of us control how the mechanics work or how the server is run. We can disagree in how the buffs should look and I'm sure everyone will. I'm waiting for the replies hating the points boost idea, but I think it is the best replacement for the old one that reduced siege DP cost, since as we've established, the DP system no longer exists