Right, but, the "feature" of a popular standard isn't that it's a standard, but that it's popular.

The thing that was new about Facebook wasn't that it was different than MySpace, but that it was the first social network that managed to scale such that all your friends and relatives ended up using it without your pushing them to do so.

The differentiator of the serverless model is that it's a Schelling-fence development practice, such that you can find real infrastructure components in the wild that are targeted at "serverless deployment" and use them.

Or: there was likely no version of Wordpress developed specifically for your stack; but there is likely some version of Wordpress developed to be deployed on a FaaS cluster. That's what makes "serverless" worth paying attention to. Like Kubernetes, or even Linux: they're the first ubiquitous examples of their archetypes.