Serverless? There are always servers. APIs don't exist in a vacuum or scale magically.
If you don't understand how to build what's underneath, then you don't understand what's involved and are at the mercy of vendors or someone else.
If you don't understand how to build what's underneath, then you don't understand what's involved and are at the mercy of vendors or someone else.
Everybody has at best little or shaky knowledge of underlying abstraction. Yes it helps to know more, but is not really practical to expect that knowledge as the minimum required.