Europa Universalis IV: Emperor is a massive expansion that has a number of flaws that can be annoying to experience. The religion also uses the Church Aspects mechanic like the Protestants: Likewise, according to one of Paradox Interactive’s dev diaries, Hussite rulers may only become Holy Roman Emperor once “Religious Peace” is achieved.
Note 2: Although Europa Universalis IV: Emperor introduces reforms for Revolutionary Governments, I decided to stick to tradition in both my Bohemia and Austria playthroughs.
He undertook to translate the Scriptures into Czech, which helped to stabilize the Czech language. Oddly enough, I got a Bohemian Hussite king that ended up becoming Holy Roman Emperor.