when you know some feature for rather long, new unexpected tweak brings nasty surprise:
arresting priests was normally bringing disturbance to region stats, and also that of surrounding regions.
knowing that, we prepared arrest by bringing region to top conditions first, but now completely different outcome occurs: with 20-25% followers in region of about 1400 it seems all of them took arms to protect priest (about 300 peasants in report) and attacked my veteran troop of 100 men, wounding 50 of them, while region stats are intact and priest is not arrested.
as it looked really odd, we tried few more times, with the same result, and it seems to be impossible to arrest priest.
this is major change as arresting priest was the only physical measure against his dealings, limited by many other factors as well: possible only against enemy realms, only on your lands etc.
moreover, how realistic is that peasants cause so large casualties to soldiers, not to mention that they remain intact.
making priest major pain in the ass, while being financially dependent as discussed in this post, only pushes more to direction of "duke brother's" game while others would tend to avoid all that stuff.
i don't understand what this change was supposed to bring. weeding out remaining low percent of followers is incredibly harder, and without ability of military troops to interfere, that could end in not so funny game of two duke's brothers preaching one against another eternally, while lord, army and everybody else helplessly look at it. ok, infiltrator can risk his life to stop that process for two days.
generally, why are there so many changes that bring only annoyance, never something positive.
