Most operational changes are tested on real customers. A scenario is the alternative: find out first, then decide.
Why it matters
Routing changes are hard to reverse. Once a hundred accounts have been told their day is moving, moving them back costs twice. That asymmetry makes most operations change nothing for years, because the risk of being wrong is higher than the cost of staying put.
Working the change out beforehand removes the asymmetry. The question stops being “do we dare” and becomes “is this better, and by how much”.
How you notice the need for one
Changes are argued from opinion because nobody can show the outcome. Decisions get deferred to “after the season” indefinitely. The same proposal comes up twice a year and is never settled, because settling it requires evidence nobody has.
What to do
The discipline is in what you leave constant. A scenario that changes the territory, the frequencies and the technician count at once produces a different business and no learning. One variable at a time is slower and is the only version that teaches anything.
State the question narrowly before building anything — what exactly is changing, and what would make it a yes. A scenario without a stated threshold produces an interesting picture and no decision. With one, it produces an answer in an afternoon.