I ask out of ignorance as I've never played a priest. I get that the 'priest game' is meant to be meaningfully different than the regular game and am fine with that.
But medieval priests can and did fight, some quite famously (like Adhemar du Puy on the First Crusade, who may as well have been the basis for every RPG mace-wielding 'cleric' ever seen)
They even had special titles for when they held land and owed secular fealty - Prince Bishops. More common in the HRE than France or England but it did happen.
It should be a perfectly valid choice not to do so (as most priests were content to be fat and happy without putting themselves at risk) but what is the rationale for preventing it?
Game balance. Instant travel plus troops is a huge imbalance.
