Just how would (non local) branching be useful to someone writing a web application or doing client projects? I can understand branching being useful for a loc

Just how would (non local) branching be useful to someone writing a web application or doing client projects? I can understand branching being useful for a local copy so that one may implement a variety of features and then picking and choosing which to integrate. But barring special circumstances, there is only one version of a website out there running in the world, hence branching isn't at all that useful.