The author is pretty clear that their intention is to use this as a simple first step to creating an app without the hassles of bundlers, they don't seem to be advocating that one would create "medium-large" projects like this. The word "incremental" is mentioned in the first sentence.

Nor does their message come across as "why don't people do this" to me.

> Until recently though, I wasn’t sure how to make this step feel incremental.

Seems like they genuinely just found a neat way to do a thing and wanted to share it.