Serverless paradigms started as FaaS, but have grown, and are beginning to encompass BaaS offerings as well. As described previously, this is an ever-changing landscape, and the two concepts of FaaS and BaaS are coalescing into one, called serverless computing. As it stands today, the distinction is blurring, and it's difficult to say that serverless is pure FaaS. This is an important point to note.
To create modern serverless apps, FaaS is necessary, but not sufficient.
For example, a production-grade service that can crunch numbers in isolation can be created by using only FaaS. But a system that has user-facing components requires much more than a simple, ephemeral computational component.
