The value of a planning tool is decided by what happens between the result and the real world.
Why it matters
If a tool writes straight into the live schedule, every experiment is a risk and people stop experimenting. If nothing can ever be committed, planning becomes a reporting exercise nobody acts on. The useful arrangement is two steps: work it out freely, then adopt it on purpose, knowing exactly what will change.
A clear adoption step also fixes accountability. Someone decided, at a time, for a reason — which is what makes the result reviewable later.
How you notice it slipping
Plans are adopted without anybody reading what changed. Or the opposite: nothing is ever adopted, and the planning session becomes a monthly ritual with no consequence.
What to do
It is worth deciding in advance who may adopt, and for which kinds of change. Moving one appointment and re-seating four hundred are the same button and very different decisions, and the only thing separating them is an agreement about who presses it.
Make the difference explicit before adopting: how many appointments move, which customers are affected, which technicians see a different week. A plan that cannot show its own diff should not be adopted, because nobody can judge what they are agreeing to.