FL-Roam

Starting to tow a 2017 Acadia (same as 2018 and with keyless ignition) and my manual has the opening shifter boot and releasing the white lever to shift to neutral procedure. That works fine. But I realized there might be an easier way. How about just starting car in park (as normal), shift to neutral, and shut it off? This works and leaves car in neutral. I haven't towed it after this procedure, just wondered if any one knew why this would be a bad idea ?