Consider what nudging looks like in practice. To verbally nudge someone is to volley hints or suggestions but without directly addressing the issue or revealing how much you care about it. A nudge may get someone to wash the dishes, finish that report, or do a back handspring, but it’s not likely to change behavior.
It may help you to think of nudging in the physical sense. Physically, a nudge may be less aggressive than a shove or a push, but it’s more aggressive than an invitation or a helping hand. It implies prodding or pricking, which imply leading from behind. And leading from behind is an oxymoron. To lead, you must be in the lead. The only sustainable way to move another along—into GTD, healthy communication, handwashing, or any other behavior for which you’re an advocate—is to bring them along.