Because god cares about your clothes. Yes, he runs the entire universe, but still has time for fashion rules.
So, define exactly how long is long - when it comes to a woman’s dress?
You can have one Holiness preacher say that it should be so long, another says that it should be one inch longer, another says one inch longer than that.
get my point? Same goes with Amish leaders.
We are to “walk in the Spirit” so that we will not fulfill the “lusts of the flesh,” not “walk in the opinions of your leaders.”
And yes, that will cause differences of opinion, but no one person can say absolutely - with infinite precision - like Amish and others attempt to.
So, let Him, not you or the Amish run things.