The position of the cage with respect to anything else except the chain and chainrings is meaningless, unless there's interference. It's like horseshoes, close doesn't count.
If the FD cage face is on line with the chainrings, and the FD shifts and trims properly (doesn't rub chain) in all gears it's correct. The tire isn't going to magically move right and grab it, and on most bikes it would rub in the stays before it could anyway.
Sometimes bikes are like buying sausage, you don't want to think too much about what you really don't need to know.
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