A forecast is the best call you can make before the doors open. It is not a promise reality has to keep.
Something the model never saw may still happen, and no honest tool pretends otherwise. Which is exactly why, once the Singel store opens, it reports back. Its real takings become one more of the stores you already know, and the next forecast for a site like it is grounded in one more true result. The model does not stand still while your estate grows; it is refitted to what your business actually does. And your results sharpen your model, not a shared pool, unless you choose to opt in, and then only contributors benefit. Every decision feeds the next, and the range tightens.
That compounding is why teams stay, and why 95% of the models we have deployed are still in production. That is a retention figure, not a model-accuracy claim.