The idea that packing a suitcase causes more stress than checking travel documents underestimates a critical failure mode.
The weak link in all planning lies in the papers, because a single missing or expired document can cause the whole thing to fall apart.
An expired passport or non-compliant visa is the death knell of the trip, regardless of how perfect your suitcase is.
I have seen people lose thousands of euros and weeks of preparation because an expiration date was ignored.
The true scope of stress is where the trip can simply be canceled.