Limit the availability of holy war cb

[Denkt]

In CK2 religions and heritics all get holy War cbs on each other with is pretty crazy and feels a bit too simplistic even for the time period of the game. Maybe there should be some sort of limitation here such as your characters devotion could give access to holy War cbs and maybe more powerful ones at higher devotion levels.

Also it is something that could be tied into trait system such as causing/losing stress.

Like do it make sense that a ruler without any devotion and piety could call in a holy war?

Devotion do allow for better Holy wars:

Prestige and Piety remain in CK3, though with a new element to them. In CK2, you accumulated prestige that you then spent on various things - this rarely made much sense, why would launching an invasion suddenly make everyone like you less, for example? Therefore we’ve decided to split the currency part of prestige/piety from the perception part. In CK3, all prestige and piety accumulated by a character will contribute towards their Level of Fame/Devotion. These have various effects, for example, your Level of Fame increases the opinion of all secular rulers (as it did in CK2), give your more Knights, and unlocks special interactions - such as invasions should you be Tribal. Your Level of Devotion increases the opinion of the clergy and allows you to declare better Holy Wars among other things. These levels range between 0-5, with 0 representing disgrace. Instead of only losing prestige when doing truly dishonorable things, such as breaking a truce, you now also lose Levels of Fame, making the whole thing more of a hard choice. Accumulated prestige and piety can be used for various things as a currency, just like in CK2, prestige being used for vassal interactions, decisions, and war, while piety is the primary resource used when interacting with the church.

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[BeyondExpectation]

I think the problem with Holy Wars is mainly that they're too blobby. Outside of India, religious differences could be used almost whenever one wanted to justify war, allowing for expansion even greater than depicted in game, as it wasn't limited to a single duchy. (Not proposing changing that.) Instead of nerfing them to be even more ahistorical, war should be more costly. Levies replenishing slower has been talked about to death, and should be included, but there are other ways.
Holy Wars allow one to take loads of land for oneself, which strengthens your position against vassals. If powerful vassals demanded land for assisting in winning holy wars, or else would be outraged, the realm management benefit they would bring would be greatly diminished.
Something even more complicated would be some need for the conqueror to garrison conquered land; unless the locals had an unusual reason for collaboration. Instead of garrisons replenishing slowly after one took a fort, it would require using part of one's army to inhabit or else have no garrison at all. (This could apply in both war and peace, though there might be differences.)

 

[Vanhal]

Like do it make sense that a ruler without any devotion and piety could call in a holy war?

Absolutely. if you look at history, there were tons of holy wars declared by people of very doubtful religious qualities, often exactly in the purpose of gaining what we would call "piety" in the game terms, also to pacify unruly clergy, pope, religious factions in their country, giving their nobility and army something to do, to avoid being deposed, to use the holy warrior mantle for something, etc. etc.
It's actually much harder to find a holy war being waged because somebody had this amount of piety and devotion to go to war just because of it.
Support of clergy did allow to declare better holy wars though as then they obviously engaged more in preparation effort.

 

[Chlodio]

At least the Catholics and Sunni have no issue with holy wars as far I can see, the Orthodoxs, however, should not (there is a long explanation on /r/AskHistorians).