I have read now a lot of threads about the snowballingissue and for myself it is indeed gamebreaking right now. Nevertheless the devs are working on it and that is good news.
Reading all those threads and having already over 60h gameplay, my personal opinion is that:
There is not ONE faction that is overpowered. The factions seem balanced enough considered everything. Therefore the issue is a general and structural problem. How can they solve that? I have read a lot of good ideas so far but, again just my opinion, I think there is one thing that is lacking and at the same time it is basically the root of everything. It is two layered:
First the lack of diplomacy in the factions itself - for example effects of relations inbetween lords or the ruler, unhappy lords that might lead to rebellions etc. By the end of the EA they should have implemented at least some functions of innerstatepolitics.
Second: the lack of international diplomacy. I think the first steps here can be very easily implemented and I think we will see some changes here soon. Simple alliances against an overaggressors etc. I dont think we will see some sort of paradox diplomacy in the near future tho, like causus belli or revenge features. Maybe in the far future.
Most of the other things can be annoying indeed, but dont really solve the problem in the long run and do not bother me that much to be honest. Things like garrisons that starve to death, lords weird recruitementpaths, perks not working or a lot of bandits capturing lords. Those things can be solved easily and I am sure they will be sooner than later