I've learned not to think too hard about what the Amish do & don't do. They are horribly inconsistent, in my opinion.
The point was:
Jesus was asked why His disciples did not wash their hands and eating utensils before eating - as if not doing so defiled them. Jesus said that it from the inward man where one becomes defiled. That the inward man is where evil thoughts, lust, etc, comes from and defiles a person.
So, no Amish people struggle with sinful thoughts before or after Rumspringa, or even if they never leave at all during Rumspringa?
I doubt it...
So why all of the attention on clothing, beards, adhering to certain languages, etc?