I've been testing. Random war declarations and hate everywhere are still there but now you can play the game. Tribute + truce feels a powerful mechanic. Once the truce period ends another war gets declared but you use tour influence + money to stop it to continue growing your empire. Each truce requires at least 100 influence plus all the influence needed to override your stupid vassals hungry for war, so even you can manage the situation it is not free at all.
The mechanic feels a bit uninmersive because the wars still feel random with no Casus Belli or reasons behind them. In my game my kingdom faces between 4 and 7 wars. I need to sign truce with Vlandia, Western Empire and Kuzhait as they are really powerfull kingdoms capable of conquering my 6 towns in 2 game weeks. So I spend my resources in freezing those wars while enjoy playing and try (no success by now) to get more vassals.
By the time a get some more help in my kingdom my influence costs will rise so maybe there will come a day when I won't be able to have these 3 simultaneous truces.
There is still a big problem with war declarations. I am an honorable king, never raided, I treat well my friends and better my enemies, only betrayed once and it seems everybody wants war on me...
By the way to grow my kingdom I need money, lots of money, LOTS, looking at how much fills the agreement bar i will need from 1 to 3 millions per vassal. I think if I get to improve relations above 50 it could be easier to handle but it is not an easy task as I need to help lords against bandits, make expensive gifts and fight crime in their towns or the rarely event when a Lord has a quest for you. I feel like I have to play at least 20 hours grinding relationship to finally have a chance to grow my kingdom. At least it is possible thanks to truce mechanic.
I'm overall satisfied with this solution until we have a more polished system.