So, what I propose is that the backend supports downloading of files in "text/plain" without comments. Without changing the API much I assume this could be done through a query string that can be added to the "downloadUrl" and will toggle the inclusion of comments.
My use case is: I have documentation (LateX) on Drive that I collaborate with others on (editing, commenting). Our build script need to be able to download those files (just the content, no comments) and generate the documentation from the downloaded Drive files. Again, this can be achieved with some parsing but I would both expect and prefer if the Google Drive SDK/API let me download a file without its comments.