Sure, but knowing common, widespread rituals for a faith, common manifestation for deities, the duties of a cleric (not as in preaching, but as in the example that I made about the Lliiran) and so on, is good lore that can be added, and that doesn't enforce anything. It seems to me that you think personal worship is a 5e thing, while it has always been there in FR (especially for certain deities), and always stressed out by Ed Greenwood. Even then, knowing something beyond "Tyr is prayed by judges" has never been harmful. In fact, the previous deities books said things like X deity is commonly worshiped in the following ways, and proceeded to give various options (which are not, as you put it, a standardized faith, and don't preclude personal worship). However, iconic forms of worship do indeed exist, and that's not a Christian thing (a stupid example, a deity of song is iconically worshiped through song. It makes no sense for someone to worship a deity of song by forging a sword).
Furthermore, there's another important detail. What about DMs who have to paint a faith and wish to know how that faith works, how temples are structured, what the clergy does daily, and so on? Deities and faiths are an important part of worldbuilding, and that goes beyond the basic teachings of a deity (I know that you can homebrew that, but you can homebrew anything, so that's beyond the point).
Furthermore, there's another important detail. What about DMs who have to paint a faith and wish to know how that faith works, how temples are structured, what the clergy does daily, and so on? Deities and faiths are an important part of worldbuilding, and that goes beyond the basic teachings of a deity (I know that you can homebrew that, but you can homebrew anything, so that's beyond the point).
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