💃 This looks good to me!

Note that there's at least one case where this can give a different result from app = Dash(__name__): if you create app in a function that you call from a different module. The inferred root will be the last time you were at the module scope before calling a function. You could construct some very strange situations here - a function imports a module, and that module calls a function that creates the dash app... but it feels to me as though in all those situations you should really be passing in __name__ from the user code anyway, so what you have is the right solution.